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Theorem eqsstrd 3264
Description: Substitution of equality into a subclass relationship. (Contributed by NM, 25-Apr-2004.)
Hypotheses
Ref Expression
eqsstrd.1 (𝜑𝐴 = 𝐵)
eqsstrd.2 (𝜑𝐵𝐶)
Assertion
Ref Expression
eqsstrd (𝜑𝐴𝐶)

Proof of Theorem eqsstrd
StepHypRef Expression
1 eqsstrd.2 . 2 (𝜑𝐵𝐶)
2 eqsstrd.1 . . 3 (𝜑𝐴 = 𝐵)
32sseq1d 3257 . 2 (𝜑 → (𝐴𝐶𝐵𝐶))
41, 3mpbird 167 1 (𝜑𝐴𝐶)
Colors of variables: wff set class
Syntax hints:  wi 4   = wceq 1398  wss 3201
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 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-11 1555  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-ext 2213
This theorem depends on definitions:  df-bi 117  df-nf 1510  df-sb 1811  df-clab 2218  df-cleq 2224  df-clel 2227  df-in 3207  df-ss 3214
This theorem is referenced by:  eqsstrrd  3265  eqsstrdi  3280  tfisi  4691  funresdfunsnss  5865  suppssof1  6262  pw2f1odclem  7063  phplem4dom  7091  fival  7212  fiuni  7220  cardonle  7434  exmidfodomrlemim  7455  frecuzrdgtclt  10729  4sqlem19  13045  ennnfonelemkh  13096  ennnfonelemf1  13102  strfvssn  13167  setscom  13185  imasaddfnlemg  13460  imasaddflemg  13462  znleval  14732  tgrest  14963  resttopon  14965  rest0  14973  lmtopcnp  15044  metequiv2  15290  xmettx  15304  ellimc3apf  15454  dvfvalap  15475  dvcjbr  15502  dvcj  15503  dvfre  15504  uhgredgm  16060  upgredgssen  16063  umgredgssen  16064  edgumgren  16066  usgredgssen  16086  nnsf  16714
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