Theorem eleqtrrid 2294

Description: B membership and equality inference. (Contributed by NM, 4-Jan-2006.)

Hypotheses

Ref	Expression
eleqtrrid.1	⊢ 𝐴 ∈ 𝐵
eleqtrrid.2	⊢ (𝜑 → 𝐶 = 𝐵)

Assertion

Ref	Expression
eleqtrrid	⊢ (𝜑 → 𝐴 ∈ 𝐶)

Proof of Theorem eleqtrrid

Step	Hyp	Ref	Expression
1		eleqtrrid.1	. 2 ⊢ 𝐴 ∈ 𝐵
2		eleqtrrid.2	. . 3 ⊢ (𝜑 → 𝐶 = 𝐵)
3	2	eqcomd 2210	. 2 ⊢ (𝜑 → 𝐵 = 𝐶)
4	1, 3	eleqtrid 2293	1 ⊢ (𝜑 → 𝐴 ∈ 𝐶)

Syntax hints:   → wi 4   = wceq 1372   ∈ wcel 2175

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 1469  ax-gen 1471  ax-ie1 1515  ax-ie2 1516  ax-4 1532  ax-17 1548  ax-ial 1556  ax-ext 2186

This theorem depends on definitions:  df-bi 117  df-cleq 2197  df-clel 2200

This theorem is referenced by:  rabsnt  3707  exmid1stab  4251  0elnn  4666  canth  5896  tfrexlem  6419  rdgtfr  6459  rdgruledefgg  6460  exmidonfinlem  7300  hashinfom  10921  ennnfonelemhom  12728  fnpr2ob  13114