posted May 1, 2018, 11:54 PM by Le Tuan Anh
[
updated May 29, 2018, 11:47 PM
]
posted May 1, 2018, 11:52 PM by Le Tuan Anh
[
updated May 1, 2018, 11:54 PM
]
posted Nov 2, 2017, 12:22 AM by Le Tuan Anh
[
updated Nov 2, 2017, 1:21 AM
]
Installationdnf install postgresql postgresql-server
# setup DB
postgresql-setup --initdb
Start/stop services systemctl start postgresql
by default, postgres use ident mode (system user account) for login, so there is no default password. To change this, update this file: /var/lib/pgsql/data/pg_hba.conf |
posted Nov 2, 2017, 12:11 AM by Le Tuan Anh
Prerequisitednf install -y nodejs
To make sure everything is working
Lorem ipsum |
posted Mar 4, 2017, 6:26 AM by Le Tuan Anh
[
updated Mar 4, 2017, 6:26 AM
]
Source: http://www.uefap.com/speaking/symbols/symbols.htm
Common
pronunciations (in British English - Gimson,1981) of mathematical and scientific symbols are given in
the list below.
(all the pages in this section need a unicode font
installed - e.g. Arial Unicode MS, Doulos SIL Unicode, Lucida
Sans Unicode - see: The International Phonetic Alphabet in
Unicode).
Symbols
| + |
plus |
/'plʌs/ |
| - |
minus |
/'maɪnəs/ |
| ± |
plus or
minus |
/'plʌs
ɔ:
'maɪnəs/ |
| x |
multiplied by |
/'mʌltɪplaɪd baɪ/ |
| / |
over; divided by |
/'əʊvə/ /dɪ'vaɪdəd/ |
| ÷ |
divided |
/dɪ'vaɪdəd/ |
| = |
equals |
/'ɪ:kwəlz/ |
| ≈ |
approximately, similar |
/ə'prɒksɪmətlɪ/ /'sɪmɪlə tʊ/ |
| ≡ |
equivalent to; identical |
/ɪk'wɪvələnt tʊ/ /aɪ'dentɪkl tʊ/ |
| ≠ |
not equal to |
/'nɒt 'iːkwəl tʊ/ |
| > |
greater than |
/'greɪtə ðən/
|
| < |
less than |
/'les ðən/ |
| ≥ |
greater than or equal to |
/'greɪtə ðən ər 'iːkwəl tʊ/ |
| ≤ |
less than or equal to |
/'les ðən ər' iːkwəl tʊ/ |
| ⊁ |
not greater than |
/'nɒt 'greɪtə ðən/ |
| ⊀ |
not less than |
/'nɒt 'les ðən/ |
| ≫ |
much greater than |
/'mʌʧ 'greɪtə ðən/ |
| ≪ |
much less than |
/'mʌʧ 'les ðən/ |
| ⊥ |
perpendicular to |
/pɜːpən'dɪkjʊlə tʊ/ |
| ∣∣ |
parallel to |
/'pærəlel tʊ/ |
| ≢ |
not equivalent to, not identical to |
/'nɒt ɪk'wɪvələnt tʊ/ /'nɒt aɪ'dentɪkl tʊ/ |
| ≄≉ |
not similar to |
/'nɒt 'sɪmɪlə tʊ/ |
| ² |
squared |
/'skweəd/ |
| ³ |
cubed |
/'kju:bd/ |
| 4 |
to the
fourth; to the power
four |
/tə ðə 'fɔːθ/ /te ðə 'pɑʊə
fɔː/ |
| n |
to the n; to the nth; to the power n |
/tə ðɪ en; tə dɪ enθ; tə ðə
pɑʊər en/ |
| √ |
root; square root |
/ru:t/ /skweə ru:t/ |
| ∛ |
cube root |
/kju:b ru:t/ |
| ∜ |
fourth root |
/fɔːθ ruːt/ |
| ! |
factorial |
/fæk'tɔːrɪəl/ |
| % |
percent |
/pə'sent/ |
| ∞ |
infinity |
/ɪn'fɪnətɪ/ |
| ∝ |
varies as; proportional to |
/'vɛərɪz/ /prə'pɔːʃənəl/ |
| ˙ |
dot |
/dɒt/ |
| ¨ |
double dot |
/dʌbl dɒt/ |
| : |
is to, ratio of |
/reɪʃɪəʊ/ |
| f(x) fx |
f; function |
/ef/ /'fʌŋkʃən/ |
| f'(x) |
f dash; derivative |
/dæʃ/ /dɪ'rɪvətɪv/ |
| f''x |
f double-dash; second derivative |
/'dʌbl dæʃ/ /'sekənd dɪ'rɪvətɪv/ |
| f'''(x) |
f triple-dash; f treble-dash; third derivative |
/'trɪpl dæʃ/ / trebl dæʃ/
/θɜ:d
dɪ'rɪvətɪv/ |
| f(4) |
f four; fourth derivative |
/fɔːθ
dɪ'rɪvətɪv/ |
| ∂ |
partial derivative, delta |
/paːʃəl dɪ'rɪvətɪv/ /deltə/ |
| ∫ |
integral |
/'ɪntɪgrəl/ |
| ∑ |
sum |
/sʌm/ |
| w.r.t. |
with respect to |
/wɪð 'rɪspekt/ |
| log |
log |
/lɒg/ |
| log₂x |
log to the base 2 of x |
/lɒg tə ðə beɪs tu: əv eks/ |
| ∴ |
therefore |
/'ðɛəfɔː/ |
| ∵ |
because |
/bɪ'kɒz/ |
| → |
gives, leads to, approaches |
/gɪvz/ /li:dz tʊ/ /əprəʊʧəz/ |
| / |
per |
/pɜ:/ |
| ∈ |
belongs to; a member of; an element of |
/bɪ'lɒŋz/ /'membə/ /'elɪmənt/ |
| ∉ |
does not belong to; is not a member
of; is not an element of |
/nɒt bɪ'lɒŋ/ /nɒt ə 'membə/ /nɒt ən 'elɪmənt/ |
| ⊂ |
contained in; a proper subset of |
/kən'teɪnd ɪn/ /'prɒpə 'sʌbset/ |
| ⊆ |
contained in; subset |
/'sʌbset/ |
| ⋂ |
intersection |
/'ɪntəsekʃən/ |
| ⋃ |
union |
/'juːnɪən/ |
| ∀ |
for all |
/fə rɔ:l/ |
| cos x |
cos x; cosine x |
/kɒz/ |
| sin x |
sine x |
/saɪn/ |
| tan x |
tangent x |
/tan/ |
| cosec x |
cosec x |
/'kəʊsek/ |
| sinh x |
shine x |
/'ʃaɪn/ |
| cosh x |
cosh x |
/'kɒʃ/ |
| tanh x |
than x |
/θæn/ |
| |x| |
mod x; modulus x |
/mɒd/ /'mɒdjʊləs/ |
| ℃ |
degrees Centigrade |
/dɪ'gri:z 'sentɪgreɪd/ |
| ℉ |
degrees Fahrenheit |
/dɪ'gri:z 'færənhaɪt/ |
| °K |
degrees Kelvin |
/dɪ'gri:z 'kelvɪn/ |
| 0°K, –273.15 °C |
absolute zero |
/absəlu:t zi:rəʊ/
|
| mm |
millimetre |
/'mɪlɪmiːtə/ |
| cm |
centimetre |
/'sentɪmiːtə/ |
| cc, cm³ |
cubic centimetre, centimetre cubed |
/'kjuːbɪk
'sentɪmiːtə/ /'sentɪmiːtə 'kju:bd/ |
| m |
metre |
/'miːtə/ |
| km |
kilometre |
/kɪ'lɒmɪtə/ |
| mg |
milligram |
/'mɪlɪgræm/ |
| g |
gram |
/græm/ |
| kg |
kilogram |
/'kɪləgræm/ |
| AC |
A.C. |
/eɪ si:/ |
| DC |
D.C. |
/di: si:/ |
Examples
| x +
1 |
x plus one |
| x
-1 |
x minus one |
| x
± 1 |
x plus or
minus one |
| xy |
x y;
x times y; x multiplied by y |
| (x
— y)(x + y) |
x
minus y, x plus y |
| x/y |
x
over y;
x
divided by y; |
| x ÷ y |
x
divided by y |
| x = 5 |
x equals
5; x is equal to 5 |
| x ≈
y |
x is approximately equal to y |
| x ≡ y |
x is
equivalent to y; x is
identical with y |
| x ≠ y |
x is not equal to y |
| x
> y |
x
is greater than y |
| x
< y |
x
is less than y |
| x ≥
y |
x is
greater than or equal to y |
| x ≤ y |
x is less than or equal to y |
| 0
< x <
1 |
zero is less
than
x is less than 1; x is greater than zero and less than 1 |
| 0 ≤ x ≤
1 |
zero is less
than or equal to
x is less than or equal to 1; x is greater than or equal to zero and
less than or equal to 1 |
| x² |
x squared |
| x³ |
x cubed |
| x4 |
x to the
fourth; x to the power
four |
| xn |
x to the n; x to the nth; x
to the power n |
| x-n |
x to the
minus n; x
to the power of minus n |
| √ |
root x; square root x; the square
root of x |
| ∛ |
the cube root of x |
| ∜ |
the fourth root of x |
 |
the nth root of x |
| (x + y)² |
x plus y all squared |
| (x/y)² |
x over y all squared |
| n! |
n factorial; factorial n |
| x% |
x percent |
| ∞ |
infinity |
| x ∝ y |
x varies as y; x is (directly) proportional to y |
| x ∝ 1/y |
x varies as one over y; x is indirectly proportional to
y |
| ẋ |
x dot |
| ẍ |
x double dot |
| f(x) fx |
f of x; the function of x |
| f'(x) |
f dash x; the (first) derivative of with respect to x |
| f''x |
f double-dash x; the second derivative of f with
respect to x |
| f'''(x) |
f triple-dash x; f treble-dash x; the third derivative
of f with respect to x |
| f(4) |
f four x; the fourth derivative of f with respect to x |
| ∂v |
the partial derivative of v |
∂v
∂θ |
delta v by delta theta, the partial derivative of v
with respect to θ |
∂²v
∂θ² |
delta two v by delta theta squared; the second partial
derivative of v with respect to θ |
| dv |
the derivative of v |
dv
dθ |
d v by d theta, the derivative of v with respect to
theta |
d²v
dθ² |
d 2 v by d theta squared, the second derivative of v
with respect to theta, |
| ∫ |
integral |
 |
integral from zero to infinity |
| ∑ |
sum |
 |
the sum from i equals 1 to n |
| w.r.t. |
with respect to |
| logey |
log to the base e of y; log y to the base e; natural
log (of) y |
| ∴ |
therefore |
| ∵ |
because |
| → |
gives, approaches |
| Δx → 0 |
delta x approaches zero |
lim
Δx→0
|
the limit as delta x approaches zero, the limit as delta x tends to zero |
Lt
Δx→0 |
the limit as delta x approaches zero, the limit as delta x tends to zero |
| m/sec |
metres per second |
| x ∈ A |
x belongs to A; x is a member of A; x is an element of A |
| x∉ A |
x does not belong to A; x is not a member of
A; x is not an element of A |
| A⊂ B |
A is contained in B; A is a proper subset of B |
| A ⊆ B |
A is contained in B; A is a subset of B |
| A ⋂ B |
A intersection B |
| A ⋃ B |
A union B |
| cos x |
cos x; cosine x |
| sin x |
sine x |
| tan x |
tangent x, tan x |
| cosec x |
cosec x |
| sinh x |
shine x |
| cosh x |
cosh x |
| tanh x |
than x |
| |x| |
mod x; modulus x |
| 18 ℃ |
eighteen degrees Centigrade |
| 70 ℉ |
seventy degrees Fahrenheit |
Greek alphabet
| Α |
α |
alpha |
/'ælfə/ |
| Β |
β |
beta |
/'bi:tə/ |
| Γ |
γ |
gamma |
/'gæmə/ |
| Δ |
δ |
delta |
/'deltə/ |
| Ε |
ε |
epsilon |
/'epsilən/ |
| Ζ |
ζ |
zeta |
/'ziːtə/ |
| Η |
η |
eta |
/'iːtə/ |
| Θ |
θ |
theta |
/'θiːtə/ |
| Ι |
ι |
iota |
/aɪ'əʊtə/ |
| Κ |
κ |
kappa |
/'kæpə/ |
| Λ |
λ |
lamda |
/'læmdə/ |
| Μ |
μ |
mu |
/'mjuː/ |
| Ν |
ν |
nu |
/'njuː/ |
| Ξ |
ξ |
xi |
/'ksaɪ/ |
| Ο |
ο |
omicron |
/'əʊmɪkrən/ |
| Π |
π |
pi |
/'paɪ/ |
| Ρ |
ρς |
rho |
/'rəʊ/ |
| Σ |
σ |
sigma |
/'sɪgmə/ |
| Τ |
τ |
tau |
/'tɑʊ/ |
| Υ |
υ |
upsilon |
/'jʊpsɪlən/ |
| Φ |
φ |
phi |
/'faɪ/ |
| Χ |
χ |
chi |
/'kaɪ/ |
| Ψ |
ψ |
psi |
/'psaɪ/ |
| Ω |
ω |
omega |
/'əʊmɪgə/ |
Roman alphabet
| A |
a |
/'eɪ/ |
| B |
b |
/'biː/ |
| C |
c |
/'siː/ |
| D |
d |
/'diː/ |
| E |
e |
/'iː/ |
| F |
f |
/'ef/ |
| G |
g |
/'ʤiː/ |
| H |
h |
/'eɪʧ/ |
| I |
i |
/'aɪ/ |
| J |
j |
/'ʤeɪ/ |
| K |
k |
/'keɪ/ |
| L |
l |
/'el/ |
| M |
m |
/'em/ |
| N |
n |
/'en/ |
| O |
o |
/'əʊ/ |
| P |
p |
/'piː/ |
| Q |
q |
/'kjuː/ |
| R |
r |
/'ɑː/ |
| S |
s |
/'es/ |
| T |
t |
/'ti:/ |
| U |
u |
/'ju:/ |
| V |
v |
/'vi:/ |
| W |
w |
/'dʌbljuː/ |
| X |
x |
/'eks/ |
| Y |
y |
/'waɪ/ |
| Z |
z |
/'zed/ |
Fractions
| ½ |
a half |
/ə 'hɑ:f/ |
| ¼ |
a quarter |
/ə 'kwɔːtə/ |
| ¾ |
three quarters |
/θriː 'kwɔːtəz/ |
| ⅓ |
a third |
/ə 'θɜ:d/ |
| ⅔ |
two thirds |
/tu: 'θɜ:dz/ |
| ⅕ |
a fifth |
/ə 'fɪfθ/ |
| ⅖ |
two fifths |
/tu: 'fɪfθs/ |
| ⅗ |
three fifths |
/θriː 'fɪfθs/ |
| ⅘ |
four fifths |
/fɔː 'fɪfθs/ |
| ⅙ |
a sixth |
/ə 'sɪksθ/ |
| ⅚ |
five sixths |
/faɪv 'sɪksθs/ |
| ⅛ |
an eighth |
/ən 'eɪtθ/ |
| ⅜ |
three eighths |
/θriː 'eɪtθs/ |
| ⅝ |
five eighths |
/faɪv 'eɪtθs/ |
| ⅞ |
seven eighths |
/sevən 'eɪtθs/ |
Decimal Fractions
| 0.1 |
nought point one |
/nɔ:t pɔɪnt wʌn/ |
| 0.01 |
nought point oh one |
/nɔ:t pɔɪnt əʊ wʌn/ |
| 0.0001 |
nought point oh oh oh one |
/ten pɔɪnt əʊ əʊ əʊ wʌn/ |
| 1.1 |
one point one |
/wʌn pɔɪnt wʌn/ |
| 1.2 |
one point two |
/wʌn pɔɪnt tu:/ |
| 1.23 |
one point two three |
/wʌn pɔɪnt tu: θri:/ |
| 1.0123 |
one point oh one two three |
/wʌn pɔɪnt əʊ wʌn tu: θri:/ |
| 10.01 |
ten point oh one |
/ten pɔɪnt əʊ wʌn/ |
| 21.57 |
twenty-one point five seven |
/'twentɪ wʌn pɔɪnt
faɪv 'sevən/ |
| 2.6666666666.... |
two point six recurring |
/tu: pɔɪnt sɪks rɪ'kɜ:rɪŋ/ |
| 2.612361236123... |
two point six one two three recurring |
/tu: pɔɪnt sɪks wʌn
tu: θri: rɪ'kɜ:rɪŋ/ |
| 2.5 million |
two point five million |
/tu: pɔɪnt
faɪv 'mɪljən/ |
SI Units: Prefixes
| 10-24 |
yocto |
y |
/'jɒktəʊ/ |
| 10-21 |
zepto |
z |
/'zeptəʊ/ |
| 10-18 |
atto |
a |
/'atəʊ/ |
| 10-15 |
femto |
f |
/'femtəʊ/ |
| 10-12 |
pico |
p |
/'pi:kəʊ/ |
| 10-9 |
nano |
n |
/'nanəʊ/ |
| 10-6 |
micro |
µ |
/'maɪkrəʊ/ |
| 10-3 |
milli |
m |
/'mɪlɪ/ |
| 10-2 |
centi |
c |
/'sentɪ/ |
| 10-1 |
deci |
d |
/'desɪ/ |
| 103 |
kilo |
k |
/'kɪləʊ/ |
| 106 |
mega |
M |
/'megə/ |
| 109 |
giga |
G |
/'gɪgə/ |
| 1012 |
tera |
T |
/'terə/ |
| 1015 |
peta |
P |
/'petə/ |
| 1018 |
exa |
E |
/'eksə/ |
| 1021 |
zetta |
Z |
/'zetə/ |
| 1024 |
yotta |
Y |
/'jɒtə/ |
| 1027 |
xona |
X |
/'zəʊnə/ |
| 1030 |
weka |
W |
/'wekə/ |
| 1033 |
vunda |
V |
/'vʊndə/ |
Cardinal Numbers
| 1 |
one |
/wʌn/ |
| 2 |
two |
/tu:/ |
| 3 |
three |
/θri:/ |
| 4 |
four |
/fɔː/ |
| 5 |
five |
/faɪv/ |
| 6 |
six |
/sɪks/ |
| 7 |
seven |
/'sevən/ |
| 8 |
eight |
/eɪt/ |
| 9 |
nine |
/naɪn/ |
| 10 |
ten |
/ten/ |
| 11 |
eleven |
/ɪ'levən/ |
| 12 |
twelve |
/twelv/ |
| 13 |
thirteen |
/θɜ:'ti:n/ |
| 14 |
fourteen |
/fɔː'ti:n/ |
| 15 |
fifteen |
/fɪf'ti:n/ |
| 16 |
sixteen |
/sɪkst'i:n/ |
| 17 |
seventeen |
/seven'ti:n/ |
| 18 |
eighteen |
/eɪ'ti:n/ |
| 19 |
nineteen |
/naɪn'ti:n/ |
| 20 |
twenty |
/'twentɪ/ |
| 21 |
twenty-one |
/twentɪ'wʌn/ |
| 22 |
twenty-two |
/twentɪ'tu:/ |
| 23 |
twenty-three |
/twentɪ'θri:/ |
| 24 |
twenty-four |
/twentɪ'fɔː/ |
| 25 |
twenty-five |
/twentɪ'faɪv/ |
| 26 |
twenty-six |
/twentɪ'sɪks/ |
| 27 |
twenty-seven |
/twentɪ'sevən/ |
| 28 |
twenty-eight |
/twentɪ'eɪt/ |
| 29 |
twenty-nine |
/twentɪ'naɪn/ |
| 30 |
thirty |
/'θɜ:tɪ/ |
| 40 |
forty |
/'fɔːtɪ/ |
| 50 |
fifty |
/'fɪftɪ/ |
| 60 |
sixty |
/'sɪkstɪ/ |
| 70 |
seventy |
/'sevəntɪ/ |
| 80 |
eighty |
/'eɪtɪ/ |
| 90 |
ninety |
/'naɪntɪ/ |
| 100 |
a hundred; one hundred |
/ə 'hʌndrəd/ /wʌn 'hʌndrəd/ |
| 101 |
a hundred and one |
/ə 'hʌndrəd ən wʌn/ |
| 102 |
a hundred and two |
/ə 'hʌndrəd ən tu:/ |
| 110 |
a hundred and ten |
/ə 'hʌndrəd ən ten/ |
| 120 |
a hundred and twenty |
/ə 'hʌndrəd ən 'twentɪ/ |
| 200 |
two hundred |
/tu: 'hʌndrəd/ |
| 300 |
three hundred |
/θri: 'hʌndrəd/ |
| 400 |
four hundred |
/fɔː 'hʌndrəd/ |
| 500 |
five hundred |
/faɪv 'hʌndrəd/ |
| 600 |
six hundred |
/sɪks 'hʌndrəd/ |
| 700 |
seven hundred |
/'sevən 'hʌndrəd/ |
| 800 |
eight hundred |
/eɪt 'hʌndrəd/ |
| 900 |
nine hundred |
/naɪn 'hʌndrəd/ |
| 1 000 |
a thousand, one thousand |
/ə θ'ɑʊzənd/ /wʌn 'θɑʊzənd/ |
| 1 001 |
a thousand and one |
/ə 'θɑʊzənd ən wʌn/ |
| 1 010 |
a thousand and ten |
/ə 'θɑʊzənd ən ten/ |
| 1 020 |
a thousand and twenty |
/ə 'θɑʊzənd ən 'twentɪ/ |
| 1 100 |
one thousand, one hunded |
/wʌn 'θɑʊzənd wʌn 'hʌndrəd/ |
| 1 101 |
one thousand, one hundred and one |
/wʌn 'θɑʊzənd wʌn 'hʌndrəd ən wʌn/ |
| 1 110 |
one thousand, one hundred and ten |
/wʌn 'θɑʊzənd wʌn 'hʌndrəd ən ten/ |
| 9 999 |
nine thousand, nine hundred and ninety-nine |
/naɪn 'θɑʊzənd naɪn 'hʌndrəd
ən 'naɪntɪ 'naɪn/ |
| 10 000 |
ten thousand |
/ten 'θɑʊzənd/ |
| 15 356 |
fifteen thousand, three hundred and fifty six |
/'fɪfti:n 'θɑʊzənd θri:
'hʌndrəd ən 'fɪftɪ sɪks/ |
| 100 000 |
a hundred thousand |
/ə 'hʌndrəd 'θɑʊzənd/ |
| 1 000 000 |
a million |
/ə 'mɪljən/ |
| 100 000 000 |
a hundred million |
/ə 'hʌndrəd 'mɪljən/ |
| 1 000 000 000 |
a billion |
/ə 'bɪljən/ |
| 100 000 000 000 |
a hundred billion |
/ə 'hʌndrəd 'bɪljən/ |
| 1 000 000 000 000 |
a trillion |
/ə 'trɪljən/ |
| 1 000 000 000 000 000 |
a quadrillion |
/ə kwɒdrɪljən/ |
| 1 000 000 000 000 000 000 |
a quintillian |
/ə kwɪn'tɪljən/ |
| 1 000 000 000 000 000 000 000 |
a sextillion |
/ə seks'tɪljən/ |
| 1 000 000 000 000 000 000 000 000 |
a septillion |
/ə sep'tɪljən/ |
| 1 000 000 000 000 000 000 000 000 000 |
an ocillion |
/ən ɒkt'tɪljən/ |
| 1 000 000 000 000 000 000 000 000 000 000 |
a nonillion |
/ə nɒn'ɪljən/ |
| 1 000 000 000 000 000 000 000 000 000 000 000 |
a decillion |
/ə de'sɪljən/ |
Ordinal Numbers
| 1st |
first |
/fɜ:st/ |
| 2nd |
second |
/'sekənd/ |
| 3rd |
third |
/θɜ:d/ |
| 4th |
fourth |
/fɔ:θ/ |
| 5th |
fifth |
/fɪfθ/ |
| 6th |
sixth |
/sɪksθ/ |
| 7th |
seventh |
/'sevənθ/ |
| 8th |
eighth |
/eɪtθ/ |
| 9th |
ninth |
/naɪnθ/ |
| 10th |
tenth |
/tenθ/ |
| 11th |
eleventh |
/ɪ'levənθ/ |
| 12th |
twelfth |
/'twelfθ/ |
| 13th |
thirteenth |
/θɜ:'ti:nθ/ |
| 14th |
fourtheenth |
/fɔː'ti:nθ/ |
| 15th |
fidteenth |
/fɪf'ti:nθ/ |
| 16th |
sixteenth |
/sɪks'ti:nθ/ |
| 17th |
seventeenth |
/seven'ti:nθ/ |
| 18th |
eighteenth |
/eɪ'ti:nθ/ |
| 19th |
nineteenth |
/naɪn'ti:nθ/ |
| 20th |
twentieth |
/'twentɪəθ/ |
| 21st |
twenty-first |
/twentɪ'fɜ:st/ |
| 22nd |
twenty-second |
/twentɪ'sekənd/ |
| 23rd |
twenty-third |
/twentɪ'θɜ:d/ |
| 24th |
twenty-fourth |
/twentɪ'fɔ:θ/ |
| 25th |
twenty-fifth |
/twentɪ'fɪfθ/ |
| 26th |
twenty-sixth |
/twentɪ'sɪksθ/ |
| 27th |
twenty-seventh |
/twentɪ'sevənθ/ |
| 28th |
twenty-eighth |
/twentɪ'eɪtθ/ |
| 29th |
twenty-ninth |
/twentɪ'naɪnθ/ |
| 30th |
thirtieth |
/'θɜːtɪəθ/ |
| 31st |
thirty-first |
/θɜːtɪ'fɜ:st/ |
| 40th |
fortieth |
/'fɔ:tɪəθ/ |
| 50th |
fiftieth |
/'fɪftɪəθ/ |
| 100th |
hundredth |
/'hʌndrədθ/ |
| 1 000th |
thousandth |
/'θɑʊzəndθ/ |
| 1 000 000th |
miilionth |
/'mɪljənθ/ |
|
posted Nov 1, 2016, 1:46 AM by Le Tuan Anh
[
updated Jan 23, 2018, 7:16 PM
]
Convert SHIFT-JIS to UTF-8
iconv --f SHIFT-JIS -t UTF-8 input-shift-jis-file.txt -o output-utf8-file.txt
MeCabSee this post. Japanese Morphological Analyzer with IGOPackage: https://pypi.python.org/pypi/igo-python/0.9.8 Sample code: >>> from igo.Tagger import Tagger
>>> t = Tagger() # use bundled dictionary
>>> for m in t.parse(u'すもももももももものうち'):
... print m.surface, m.feature
...
すもも 名詞,一般,*,*,*,*,すもも,スモモ,スモモ
も 助詞,係助詞,*,*,*,*,も,モ,モ
もも 名詞,一般,*,*,*,*,もも,モモ,モモ
も 助詞,係助詞,*,*,*,*,も,モ,モ
もも 名詞,一般,*,*,*,*,もも,モモ,モモ
の 助詞,連体化,*,*,*,*,の,ノ,ノ
うち 名詞,非自立,副詞可能,*,*,*,うち,ウチ,ウチ
>>>
[TO BE UPDATED] |
posted May 11, 2016, 12:07 AM by Le Tuan Anh
[
updated Sep 25, 2017, 2:59 AM
]
Install Mecab
Download these files
- mecab-0.996
- mecab-ipadic-2.7.0-20070801
Make (Source: https://sites.google.com/site/casualconc/utility-programs/install-mecab-ruby---detail) Note: Make sure that you have installed the gcc-c++ package. sudo dnf install -y gcc-c++
cd mecab-0.996
./configure --with-charset=utf-8
make
make check
sudo make install
cd mecab-ipadic-2.7.0-20070801
./configure --with-charset=utf-8
make
sudo make install
# mecab-python3
sudo pip install mecab-python3
# for python 2
sudo pip install mecab-python
# (See this as well: http://d.hatena.ne.jp/addition/20130405/1365089276)
# Basically, you should edit the file /etc/ld.so.conf
# and its content should look like this
include ld.so.conf.d/*.conf
/usr/local/lib |
# and then run this command:
sudo ldconfig
# Alternatively, you can add mecab's lib folder to LD_LIBRARY_PATH to tell Python where to find the SO file.
# E.g. Add this to your .bashrc file
export LD_LIBRARY_PATH=${LD_LIBRARY_PATH}:/home/username/local/mecab/lib
# There are two important executable files for mecab which are mecab-config and mecab.
# These two files can be found in mecab installation folder (by default they are at /usr/bin/mecab and /usr/bin/mecab-config)
|
Using Mecab
# show help
mecab -h
# analyse a file
mecab sentences.txt
# analyse a sentence
mecab "私は猫が大好きだな。"
# tokenization a sentence
mecab -O wakati "私は猫が大好きだな。"
|
MeCab-python
Read more here: http://aidiary.hatenablog.com/entry/20101121/1290339360)
mecab = MeCab.Tagger("-O wakati")
print(mecab.parse('私は猫が大好きだな。')) |
With JACY/ACE
echo "アブラを売る。" | mecab -O wakati | ace -g jacy.dat -1Tf |
In case you don't have permission, download the file mecab-all.tar.gz below, and run install_local.sh to run it locally. The complete script can be found in the download section below.
|
posted Apr 18, 2016, 2:06 AM by Le Tuan Anh
[
updated Aug 10, 2017, 5:56 PM
]
Setup cygwin environment:
- Install cygwin from here: https://cygwin.com/install.html
- Install packages
- gcc (gcc-g++, gcc-core, make, cmake, automake, etc.)
- To use cygwin gcc instead of other Windows' gcc, use:
export CC=/usr/bin/gcc
- geany
- emacs
- python (lxml, libxslt, libxslt-devel, python-libxml2, tkinter, python-dev, pip), same thing for python3
- pygtk
- openssh, filezilla, wget
- sqliteman
- To use X display
- Install packges
xorg-server and xinit - and run
startxwin (or nohup startxwin >/dev/null 2>&1 &) - To show running jobs, use jobs -l .
- Set display: export DISPLAY=:0.0
- To run geany using xwin use: nohup geany --display=:0.0 >/dev/null 2>&1 &
- You can forward X11 to your local machine by doing:
- on cygwin,
export DISPLAY=:0.0
- start Xwin service
startxwin
- use -XY flags to enable X11 forward in SHH:
ssh -XY [username]@[host]
- Profit!
- Editing host file at
C:\Windows\System32\Drivers\etc\hosts
- And more
|
posted Jan 12, 2016, 12:18 AM by Le Tuan Anh
[
updated May 15, 2017, 8:54 PM
]
SQLite
Execute a script file
|
Executing a script file
|
$sqlite3 dbfile.db < scriptfile.sql
|
| Executing a command
|
echo "SELECT * FROM atable" | sqlite3 dbfile.db
|
MySQL
Lorem ipsum
PostgreSQL
Lorem ipsum |
posted Sep 3, 2015, 10:50 PM by Le Tuan Anh
[
updated Aug 16, 2016, 11:34 PM
]
This weird stuff (predicate logic) is for HG2002 and HG4049. I know it can be really tough for you guys. Don't give up, just read the book and solve the problems after each chapter. If you have any problem solving them just email me what you have done and we'll look into it together.
To be able to solve these problems in quizzes or exams here are few hints for you (it's not an exhausted list, feel free to ask me and I'll update this):
- Read the book:
- Focus on 309-327 pp, scan through the text and read the examples.
- Try your best to solve all 10.x problems. You MUST be able to solve 10.1 to 10.4 by yourself to be ready for quizzes and exams.
- Skill check list
- Be able to build truth tables instead of citing them from memory
- Be able to identify predicates, relations, constant value, variables, quantifiers, etc.
- Be able to solve any logical sentence
Build truth table
For more information, see this page: https://en.wikipedia.org/wiki/List_of_logic_symbols
| Symbol |
Usage
|
How to remember
|
Examples |
| ¬ |
Negation
|
Reverse the given value
|
¬True ≡ False
¬False ≡ True
¬(¬False) ≡ True
|
| ∧ |
Conjunction (AND relation)
|
True iff both given values are true
|
|
| ∨ |
Disjunction (OR relation)
|
True as long as one given value is true
|
|
| ≡ |
If and only if
|
True iff both values are the same
|
(True≡True) is True
|
| ⊕ |
Exclusive disjunction (XOR, Exclusive OR)
|
True if two given values are different
|
True ⊕ False = True
True ⊕ True = False
|
| → |
Implication (if ... then ...)
P → Q
Antecedent (P) IMPLIES consequent (Q)
Hypothesis
|
True iff either we have consequent (Q≡True) or we don't have antedecent (P≡False) |
|
[TO BE UPDATED]
Derive logical sentences from English sentences
WARNING: Read Saeed 2003, section 10.3: Translating English into a Logical Metalanguage. This is a MUST if you want to solve question 6 in tutorial 4.
Hints on how to translate from English sentences to predicate logic sentences
- Identify variables, predicates and individual constants. Just list them first, then we will form sentences later.
- Variables: place-holder elements, can take quantifiers (universal quantifiers every or existential quantifiers some)
- Individual constant: A single individual obviously
- Predicates: relations, mostly verbs
- Combine what we have listed down to form a sentence. Be careful about scoping.
Examples:
Bill sleeps.
| Bill |
sleeps.
|
| N |
V |
b (invididual)
|
S( )
predicate
|
Answer: S(b)
Dogs sleep.
| Dogs |
sleep.
|
| N |
V |
x
(variable)
|
S( )
predicate
|
This is tricky because we have to scope variable d properly here. There are two ways.
1) For every x which is a dog, that particular x sleeps.
If you go this way, you have:
[∀(x): Dog(x)] Sleep(x)
2) For every individual x, if that individual x is a dog, it sleeps.
Answer: ∀x [ Dog(x) → Sleep(x) ]
Choose the types that you feel easier to remember. And don't worry about the predicate name, what I have wrote and the short form is the same. For example [∀(x): D(x)] S(x) is perfectly fine. I prefer the verbose version because when we have to deal with long sentences, it's hard to remember which is which. It's up to you to decide.
Everybody loves HG2002.
| Everybody |
loves |
HG2002
|
| N |
V |
N
|
all person
variable
|
love( )
predicate
|
HG2002
individual
|
Use the same approach as above, we have:
[∀(x): Person(x)] Love(x, hg2002) or if you want to show off as a hardcore logician and confuse people, write: [∀(x): P(x)] L(x, h) and it's perfectly fine.
Every dog chases a cat.
There are two interpretations. If you want to express There is a specific cat that every dog chase, you write
| Sane Human |
Hardcore Logicians
|
[∃(x): Cat(x)] ∀y ( Dog(y) → Chase(y,x) )
|
[∃(x): C(x)] ∀y ( D(y)→ Ch(y,x) ) |
[∃(x): Cat(x)] [∀y: Dog(y)] Chase(y,x)
| [∃(x): C(x)] [∀y: D(y)] Ch(y,x) |
Now it's your turn, what if you want to express For every dog there must be a cat which that particular dog chases. Solve this and show me your answer so I know that you are understood these problems. Scope Ambiguity
Many students find that this is very difficult to understand. This slide may help.
|
|
