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Theorem orc 724
Description: Introduction of a disjunct. Theorem *2.2 of [WhiteheadRussell] p. 104. (Contributed by NM, 30-Aug-1993.) (Revised by NM, 31-Jan-2015.)
Assertion
Ref Expression
orc  |-  ( ph  ->  ( ph  \/  ps ) )

Proof of Theorem orc
StepHypRef Expression
1 id 19 . . 3  |-  ( (
ph  \/  ps )  ->  ( ph  \/  ps ) )
2 jaob 722 . . 3  |-  ( ( ( ph  \/  ps )  ->  ( ph  \/  ps ) )  <->  ( ( ph  ->  ( ph  \/  ps ) )  /\  ( ps  ->  ( ph  \/  ps ) ) ) )
31, 2mpbi 145 . 2  |-  ( (
ph  ->  ( ph  \/  ps ) )  /\  ( ps  ->  ( ph  \/  ps ) ) )
43simpli 111 1  |-  ( ph  ->  ( ph  \/  ps ) )
Colors of variables:    wff set class
This proof depends on syntax axioms:    -> wi 4    /\ wa 104    \/ wo 720
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-io 721
This proof depends on definitions:  df-bi 117
This theorem is used by:  pm2.67-2  725  pm1.4  739  orci  743  orcd  745  orcs  747  pm2.45  750  biorfi  758  pm1.5  777  pm2.4  790  pm4.44  791  pm4.78i  794  pm4.45  796  pm3.48  797  pm2.76  820  orabs  826  ordi  828  andi  830  pm4.72  839  biort  841  dcim  853  pm2.54dc  903  pm2.85dc  917  dcor  948  pm5.71dc  974  dedlema  982  3mix1  1197  xoranor  1426  19.33  1537  hbor  1599  nford  1620  19.30dc  1680  19.43  1681  19.32r  1732  moor  2158  r19.32r  2697  ssun1  3392  undif3ss  3492  reuun1  3515  prmg  3835  opthpr  3897  exmidn0m  4340  issod  4466  elelsuc  4556  ordtri2or2exmidlem  4675  regexmidlem1  4682  fununmo  5426  nndceq  6777  nndcel  6778  swoord1  6841  swoord2  6842  exmidontri2or  7608  addlocprlem  7908  msqge0  8952  mulge0  8955  ltleap  8968  nn1m1nn  9331  elnnz  9663  zletric  9697  zlelttric  9698  zmulcl  9707  zdceq  9729  zdcle  9730  zdclt  9731  ltpnf  10198  xrlttri3  10215  xrpnfdc  10260  xrmnfdc  10261  fzdcel  10460  qletric  10692  qlelttric  10693  qdceq  10695  qdclt  10696  qsqeqor  11107  hashfiv01gt1  11242  isum  12176  iprodap  12371  iprodap0  12373  nn0o1gt2  12696  prm23lt5  13070  4sqlem17  13214  gsummptfidmsplit  14253  ppiprm  16276  ppidif  16286  gausslemma2dlem0f  16395  bj-trdc  17002  bj-nn0suc0  17198  triap  17301  tridceq  17330
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