Theorem eqsstrrd 3221

Description: Substitution of equality into a subclass relationship. (Contributed by NM, 25-Apr-2004.)

Hypotheses

Ref	Expression
eqsstrrd.1	⊢ (𝜑 → 𝐵 = 𝐴)
eqsstrrd.2	⊢ (𝜑 → 𝐵 ⊆ 𝐶)

Assertion

Ref	Expression
eqsstrrd	⊢ (𝜑 → 𝐴 ⊆ 𝐶)

Proof of Theorem eqsstrrd

Step	Hyp	Ref	Expression
1		eqsstrrd.1	. . 3 ⊢ (𝜑 → 𝐵 = 𝐴)
2	1	eqcomd 2202	. 2 ⊢ (𝜑 → 𝐴 = 𝐵)
3		eqsstrrd.2	. 2 ⊢ (𝜑 → 𝐵 ⊆ 𝐶)
4	2, 3	eqsstrd 3220	1 ⊢ (𝜑 → 𝐴 ⊆ 𝐶)

Syntax hints:   → wi 4   = wceq 1364   ⊆ wss 3157

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-5 1461  ax-7 1462  ax-gen 1463  ax-ie1 1507  ax-ie2 1508  ax-8 1518  ax-11 1520  ax-4 1524  ax-17 1540  ax-i9 1544  ax-ial 1548  ax-i5r 1549  ax-ext 2178

This theorem depends on definitions:  df-bi 117  df-nf 1475  df-sb 1777  df-clab 2183  df-cleq 2189  df-clel 2192  df-in 3163  df-ss 3170

This theorem is referenced by:  ssxpbm  5106  ssxp1  5107  ssxp2  5108  suppssof1  6157  tfrlemiubacc  6397  tfr1onlemubacc  6413  tfrcllemubacc  6426  oaword1  6538  phplem4dom  6932  fisseneq  7004  nnnninfeq2  7204  archnqq  7503  imasaddfnlemg  13018  resmhm2  13192  ringidss  13663  subrg1  13865  subrgdvds  13869  subrguss  13870  subrginv  13871  islss3  14013  lspsnneg  14054  epttop  14434  metequiv2  14840  limccnpcntop  15019  limccnp2lem  15020  limccnp2cntop  15021  nnsf  15760