Step
*
of Lemma
geo-gt-implies-lt
∀g:EuclideanPlane. ∀a,b,c,d:Point. (ab > cd
⇒ (¬¬|cd| < |ab|))
BY
{ ((((((Auto THEN D -1 THEN Auto) THEN ExRepD) THEN RemoveDoubleNegation) THEN Auto)
THEN Unfold `geo-lt` 0
THEN InstConcl [⌜w⌝;⌜b⌝]⋅
THEN Auto)
THEN (FLemma `geo-add-length-between` [7] THENA Auto)
THEN (Subst' |aw| + |wb| = |cd| + |wb| ∈ Length -1 THEN Auto)
THEN RWO "-1" 0
THEN EAuto 1) }
Latex:
Latex:
\mforall{}g:EuclideanPlane. \mforall{}a,b,c,d:Point. (ab > cd {}\mRightarrow{} (\mneg{}\mneg{}|cd| < |ab|))
By
Latex:
((((((Auto THEN D -1 THEN Auto) THEN ExRepD) THEN RemoveDoubleNegation) THEN Auto)
THEN Unfold `geo-lt` 0
THEN InstConcl [\mkleeneopen{}w\mkleeneclose{};\mkleeneopen{}b\mkleeneclose{}]\mcdot{}
THEN Auto)
THEN (FLemma `geo-add-length-between` [7] THENA Auto)
THEN (Subst' |aw| + |wb| = |cd| + |wb| -1 THEN Auto)
THEN RWO "-1" 0
THEN EAuto 1)
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