x → 0 lim x ! x = ?
Note: Treat x ! = Γ ( x + 1 ) .
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If we define
x
!
:
=
Γ
(
x
+
1
)
, then by definition of continuity,
x
→
0
lim
x
!
x
=
1
0
=
0
,
because
f
(
x
)
=
x
and
g
(
x
)
=
x
!
are continuous at every
x
∈
C
meaning that
g
(
x
)
f
(
x
)
is continuous at every
x
∈
C
such that
g
(
x
)
=
0
.
Hence, the answer is 0 .
But what is tau function?
Since x! = 0 and 0/1 is equal to zero, we can say that this limit equal to 0 by implementing "0" in expression.
P. S. I'm not good in formatting text, especially math symbols, so I hope you understand my explanation
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= x → 0 lim Γ ( x ) 1 Because lim x → 0 Γ ( x ) = ∞ , we get
x → 0 lim Γ ( x ) 1 = ∞ 1 = 0