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Theorem sseqtrri 3283
Description: Substitution of equality into a subclass relationship. (Contributed by NM, 4-Apr-1995.)
Hypotheses
Ref Expression
sseqtrri.1  |-  A  C_  B
sseqtrri.2  |-  C  =  B
Assertion
Ref Expression
sseqtrri  |-  A  C_  C

Proof of Theorem sseqtrri
StepHypRef Expression
1 sseqtrri.1 . 2  |-  A  C_  B
2 sseqtrri.2 . . 3  |-  C  =  B
32eqcomi 2242 . 2  |-  B  =  C
41, 3sseqtri 3282 1  |-  A  C_  C
Colors of variables:    wff set class
This proof depends on syntax axioms:    = wceq 1402    C_ wss 3220
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-11 1559  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-ext 2220
This proof depends on definitions:  df-bi 117  df-nf 1514  df-sb 1816  df-clab 2225  df-cleq 2231  df-clel 2234  df-in 3226  df-ss 3233
This theorem is used by:  eqimss2i  3305  difdif2ss  3488  snsspr1  3863  snsspr2  3864  snsstp1  3865  snsstp2  3866  snsstp3  3867  prsstp12  3868  prsstp13  3869  prsstp23  3870  iunxdif2  4061  pwpwssunieq  4101  sssucid  4562  opabssxp  4851  dmresi  5121  cnvimass  5153  ssrnres  5233  cnvcnv  5243  cnvssrndm  5312  dmmpossx  6439  tfrcllemssrecs  6627  sucinc  6722  mapex  6932  exmidpw  7219  exmidpweq  7220  casefun  7431  djufun  7450  pw1ne1  7594  ressxr  8375  ltrelxr  8392  nnssnn0  9577  un0addcl  9607  un0mulcl  9608  nn0ssxnn0  9644  fzssnn  10491  fzossnn0  10601  isumclim3  12215  isprm3  12921  phimullem  13032  ballotfilem7  13337  tgvalex  13676  eqgfval  14084  gsummptfidmsplit  14254  cnfldbas  15006  mpocnfldadd  15007  mpocnfldmul  15009  cnfldcj  15011  cnfldtset  15012  cnfldle  15013  cnfldds  15014  cnrest2  15462  qtopbasss  15747  tgqioo  15781
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