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Introduction to PDA
Consider the ...
Question
Consider the following sets
L
1
and
L
2
.
L
1
=
{
L
|
L
accepted by " PDA by final state " over
Σ
=
{
a
,
b
}
}
L
2
=
{
L
|
L
accepted by " PDA by Empty state " over
Σ
=
{
a
,
b
}
}
Which of the relation is correct?
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Solution
option (a)
L
1
=
L
2
Set of all CFLs
Note: PDA by Final state
≅
PDA by Empty stack.
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0
Similar questions
Q.
Let L =
L
1
∩
L
2
, where
L
1
a
n
d
L
2
are languages as defined below:
L
1
={
a
m
b
m
c
a
n
b
n
|
m
,
n
≥
0
}
L
2
={
a
i
b
j
c
k
|
i
,
j
,
k
≥
0
}
Then L is
Q.
Consider the following problems:
(a) L is a context sensitive languages (CSL), complement of L is of same type.
(b) Let
L
1
and
L
2
is CSL, intersection of
L
1
and
L
2
is empty or not.
(c) Finiteness problem in CFGs.
(d) Emptiness problem for CFGs
Which of the following problwms is/are decidable?
Q.
If
L
1
=
{
a
n
∣
n
≥
0
}
and
L
2
=
{
b
n
∣
n
≥
0
}
, consider
I.
L
1
⋅
L
2
is a regular language
II.
L
1
⋅
L
2
=
{
a
n
b
n
∣
n
≥
0
}
Which one of the following is CORRECT?
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