Theorem equcomd 2023

Description: Deduction form of equcom 2022, symmetry of equality. For the versions for classes, see eqcom 2740 and eqcomd 2739. (Contributed by BJ, 6-Oct-2019.)

Hypothesis

Ref	Expression
equcomd.1	⊢ (𝜑 → 𝑥 = 𝑦)

Assertion

Ref	Expression
equcomd	⊢ (𝜑 → 𝑦 = 𝑥)

Proof of Theorem equcomd

Step	Hyp	Ref	Expression
1		equcomd.1	. 2 ⊢ (𝜑 → 𝑥 = 𝑦)
2		equcom 2022	. 2 ⊢ (𝑥 = 𝑦 ↔ 𝑦 = 𝑥)
3	1, 2	sylib 217	1 ⊢ (𝜑 → 𝑦 = 𝑥)

Syntax hints:   → wi 4

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1798  ax-4 1812  ax-5 1914  ax-6 1972  ax-7 2012

This theorem depends on definitions:  df-bi 206  df-an 398  df-ex 1783

This theorem is referenced by:  sndisj  5140  fsumcom2  15720  fprodcom2  15928  catideu  17619  pospo  18298  dprdfcntz  19885  ordtt1  22883  eengtrkg  28275  cusgrfilem2  28744  frgr2wwlk1  29613  ssmxidl  32621  gonar  34417  bj-nfcsym  35827  exidu1  36772  rngoideu  36819  2reu8i  45869  ichnreuop  46188  sprsymrelf1lem  46207