Step
*
of Lemma
Euclid-prop13
∀g:EuclideanPlane. ∀a,b,c,d:Point. (c-b-d
⇒ a # cd
⇒ abc + abd ≅ cbd)
BY
{ (Auto THEN Assert ⌜a ≠ b⌝⋅) }
1
.....assertion.....
1. g : EuclideanPlane
2. a : Point
3. b : Point
4. c : Point
5. d : Point
6. c-b-d
7. a # cd
⊢ a ≠ b
2
1. g : EuclideanPlane
2. a : Point
3. b : Point
4. c : Point
5. d : Point
6. c-b-d
7. a # cd
8. a ≠ b
⊢ abc + abd ≅ cbd
Latex:
Latex:
\mforall{}g:EuclideanPlane. \mforall{}a,b,c,d:Point. (c-b-d {}\mRightarrow{} a \# cd {}\mRightarrow{} abc + abd \mcong{} cbd)
By
Latex:
(Auto THEN Assert \mkleeneopen{}a \mneq{} b\mkleeneclose{}\mcdot{})
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