Automata and Formal Language (chapter 6) ppt
Automata and Formal Language (chapter 6) ppt
... (cont’d)
Proof:
•
Draw the variable dependency graph for G
1
and find all
variables that cannot be reached from S.
•
Remove those variables and the productions involving them.
•
Eliminate any terminal ... V
1
.
•
Reduce the length of the right sides of the productions:
1. Put all productions A → a and A → BC into P^.
2. Repeat until no more productions are added to P^:
For each...
Automata and Formal Language (chapter 3) ppt
... of the form:
A → xB
A → x
A, B ∈ V and x ∈ T
*
Theorem 3.4
L is a regular language iff there exists a
regular grammar
G such that L = L(G).
Regular Language and
Regular Grammar
Example 3.3
r ... Recalled
•
Formal grammar:
G = (V, T, S, P)
V: finite set of variables
T: finite set of terminal symbols
S∈V: start variable
P: finite set of productions
Equivalent Regular Expression
r
1...
Automata and Formal Language (chapter 1) pot
... ngôn ngữ hình thức.
Hồ Văn Quân
•
An introduction to formal languages and automata.
Peter Linz
•
Introduction to automata theory, languages, and computation.
John Hopcroft & Jeffrey Ullman
Automaton ... Language (cont’d)
•
Language: a subset L of Σ*
•
Sentence: a string in L
•
Example 1.3: In Example 1.2, L is a language on Σ, w is a
string of Σ but not a sentence in L
Fo...
Automata and Formal Language (chapter 4) pdf
... F and y ∈ L
2
q
1
q
2
b
b
Questions about RL
2. Is there an algorithm to determine whether or not a regular language is
empty, finite, or infinite?.
Yes.
Right Quotient
Let L
1
and L
2
be languages ... L
1
and
y ∈ L
2
}
Homomorphism (cont’d)
If L is a language on Σ, then its homomorphic image is defined as:
h(L) = {h(w): w ∈ L}
Questions about RL
3. Given two regular languages L...
Automata and Formal Language (chapter 7) pot
... erase A and move to q
k
if receiving a and
at q
j
erase BC and move to q
k
At q
i
erase A and move to q
k
if receiving a and
at q
j
erase B and move to q
m
and
at q
m
erase C and move ... A and move to q
k
if receiving a and
at q
j
erase B and move to q
m
and
at q
m
erase C and move to q
k
(q
i
Aq
k
) → a(q
j
Bq
m
)(q
m
Cq
k
)
2
Pushdown Automata
•
There a...
Cryptography and Network Security Chapter 6 pptx
... (i + 1) (mod 2 56)
i = (i + 1) (mod 2 56)
j = (j + S[i]) (mod 2 56)
j = (j + S[i]) (mod 2 56)
swap(S[i], S[j])
swap(S[i], S[j])
t = (S[i] + S[j]) (mod 2 56)
t = (S[i] + S[j]) (mod 2 56)
C
C
i
i
= ... stream)
have a pseudo random
have a pseudo random
keystream
keystream
combined (XOR) with plaintext bit by bit
combined (XOR) with plaintext bit by bit
randomness of
randomne...
Automata and Formal Language
... ngôn ngữ hình thức.
Hồ Văn Quân
•
An introduction to formal languages and automata.
Peter Linz
•
Introduction to automata theory, languages, and computation.
John Hopcroft & Jeffrey Ullman
Storage
A ... configuration
Generated Language
G = (V, T, S, P)
L(G) = {w∈T* | S ⇒* w}
•
Example 1.8:
Take into consideration the grammar given in
Example 1.6:
L(G) = {a
n
b
n
| n ≥ 0}...
Automata and Formal language docx
... Ab
A → aAb
A → λ
3
Formal Languages & Automata
A formal language:
Is an abstraction of the general characteristics of programming languages.
Consists of a set of symbols and some formation ... trên.
15
Languages
Language concatenation:
L1L2 = {xy | x∈L1, y∈L2}
L
n
= L L L (n times)
L
0
= {λ}
13
Languages
Language: a subset L of Σ
*
Word or Sentence: a string in L...
Tài liệu LUYỆN ĐỌC TIẾNG ANH QUA TÁC PHẨM VĂN HỌC-Pride and Prejudice -Jane Austen -Chapter 6 ppt
... and unaffected, had been listened to with much
more pleasure, though not playing half so well; and Mary, at the end of a
long concerto, was glad to purchase praise and gratitude by Scotch and ... knowledge and accomplishments, was always impatient for
display.
Mary had neither genius nor taste; and though vanity had given her
application, it had given her likewise a pedantic...
Fate of Pharmaceuticals in the Environment and in Water Treatment Systems - Chapter 6 pptx
... further
reducethepersistenceandmobilityofpharmaceuticalsintheenvironment.Inasim
-
il
armanner,municipalwastewatertreatmentplantsgeneratepharmaceutical-laden
biosolidsandwastewaterefuents,whicharedisposedbylandapplicationandused
tomeetirrigationdemandsinaridregions.Recentsurveysoforganiccontaminants
in wastewater efuents and biosolids have ... positively
chargedsurfacesofmetal-hydrousoxide...
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