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DaEqvDaDa
⊢
f
≡
f
DaEqvDaDa
Proof:
1
⊢
f
≡
f
DaEqvDtDi
2
⊢
f
≡
f
DiEqvDiDi
3
⊢
f
≡
f
2
,
DiamondImpDiamond
4
⊢
f
≡
f
PTL
5
⊢
f
≡
f
DtDiEqvDiDt
6
⊢
f
≡
f
5
,
DiamondEqvDiamond
7
⊢
f
≡
f
1
,
3
,
4
,
6
,
EqvChain
8
⊢
f
≡
f
DaEqvDtDi
9
⊢
f
≡
f
1
,
DaEqvDa
10
⊢
f
≡
f
7
,
8
,
9
,
Prop
qed
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2023-09-12
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