Step
*
of Lemma
le-add-cancel4
∀[c,t,t':ℤ]. uiff((c + t) ≤ t';c ≤ 0) supposing t = t' ∈ ℤ
BY
{ ((UnivCD THENA Auto)
THEN (InstLemma `le-add-cancel3` [⌜c⌝;⌜0⌝;⌜t⌝;⌜t'⌝]⋅ THENA Auto)
THEN Subst' 0 + t' ~ t' -1
THEN Try (Hypothesis)) }
1
.....equality.....
1. c : ℤ
2. t : ℤ
3. t' : ℤ
4. t = t' ∈ ℤ
5. uiff((c + t) ≤ (0 + t');c ≤ 0)
⊢ 0 + t' ~ t'
Latex:
Latex:
\mforall{}[c,t,t':\mBbbZ{}]. uiff((c + t) \mleq{} t';c \mleq{} 0) supposing t = t'
By
Latex:
((UnivCD THENA Auto)
THEN (InstLemma `le-add-cancel3` [\mkleeneopen{}c\mkleeneclose{};\mkleeneopen{}0\mkleeneclose{};\mkleeneopen{}t\mkleeneclose{};\mkleeneopen{}t'\mkleeneclose{}]\mcdot{} THENA Auto)
THEN Subst' 0 + t' \msim{} t' -1
THEN Try (Hypothesis))
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