First
(
X
) &
Empty
(
X
) pro
G
expr
3
: Celkově
23/57
Empty
(
i
)
:=
Æ
Empty
(
+
)
:=
Æ
Empty
(
*
)
:=
Æ
Empty
(
(
)
:=
Æ
Empty
(
)
)
:=
Æ
Empty
(
E
)
:=
Æ
Empty
(
E
’
)
:=
{
e
}
Empty
(
T
)
:=
Æ
Empty
(
T
’
)
:=
{
e
}
Empty
(
F
)
:=
Æ
G
expr
3
= (
N
,
T
,
P
,
E
), kde:
N
= {
E
,
F
,
T
},
T
= {
i
,
+
,
*
,
(
,
)
},
P
= {
1
:
E
®
T
E
’
,
2
:
E
’
®
+
TE
’
,
3
:
E
’
®
e
,
4
:
T
®
FT
’
5
:
T
’
®
*
FT
’
,
6
:
T
’
®
e
,
7
:
F
®
(
E
)
,
8
:
F
®
i
}
Množina
Empty
pro
všechna
X
Î
N
È
T
:
First
(
i
)
:= {
i
}
First
(
+
)
:= {
+
}
First
(
*
)
:= {
*
}
First
(
(
)
:= {
(
}
First
(
)
)
:= {
)
}
Množina
First
pro
všechna
X
Î
N
È
T
:
First
(
E
)
:=
{
i
,
(
}
First
(
E
’
)
:=
{
+
}
First
(
T
)
:=
{
i
,
(
}
First
(
T
’
)
:=
{
*
}
First
(
F
)
:=
{
i
,
(
}
Pozn.:
pro
každé
a
Î
T
:
Empty
(
a
) =
Æ
,
First
(
a
) = {
a
}