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SUPPLEMENTARY MATERIAL (USERS' MATHBOXES)
Mathbox for Thierry Arnoux
Decimal expansion
Division in the extended real number system
xdiv0rp
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Theorem
xdiv0rp
Description:
Division into zero is zero.
(Contributed by
Thierry Arnoux
, 18-Dec-2016)
Ref
Expression
Assertion
xdiv0rp
⊢
A
∈
ℝ
+
→
0
÷
𝑒
A
=
0
Proof
Step
Hyp
Ref
Expression
1
rprene0
⊢
A
∈
ℝ
+
→
A
∈
ℝ
∧
A
≠
0
2
xdiv0
⊢
A
∈
ℝ
∧
A
≠
0
→
0
÷
𝑒
A
=
0
3
1
2
syl
⊢
A
∈
ℝ
+
→
0
÷
𝑒
A
=
0