Theorem ndsubeql-P7.22a.CL 911

Description: Closed Form of ndsubeql-P7.22a 847. †

Assertion

Ref	Expression
ndsubeql-P7.22a.CL	⊢ (𝑡 = 𝑢 → (𝑡 = 𝑤 ↔ 𝑢 = 𝑤))

Proof of Theorem ndsubeql-P7.22a.CL

Step	Hyp	Ref	Expression
1		rcp-NDASM1of1 192	. 2 ⊢ (𝑡 = 𝑢 → 𝑡 = 𝑢)
2	1	ndsubeql-P7.22a 847	1 ⊢ (𝑡 = 𝑢 → (𝑡 = 𝑤 ↔ 𝑢 = 𝑤))

Syntax hints:   = wff-equals 6   → wff-imp 10   ↔ wff-bi 104

This theorem was proved from axioms:  ax-L1 11  ax-L2 12  ax-L3 13  ax-MP 14  ax-GEN 15  ax-L4 16  ax-L5 17  ax-L6 18  ax-L7 19

This theorem depends on definitions:  df-bi-D2.1 107  df-and-D2.2 133  df-or-D2.3 145  df-true-D2.4 155  df-rcp-AND3 161  df-exists-D5.1 596

This theorem is referenced by:  lemma-L7.01a  924  nfreetjust-P8  1115