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| Description: Introduction of a disjunct. Axiom *1.3 of [WhiteheadRussell] p. 96. (Contributed by NM, 30-Aug-1993.) (Revised by NM, 31-Jan-2015.) |
| Ref | Expression |
|---|---|
| olc |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | id 19 |
. . 3
| |
| 2 | jaob 722 |
. . 3
| |
| 3 | 1, 2 | mpbi 145 |
. 2
|
| 4 | 3 | simpri 113 |
1
|
| Colors of variables: wff set class |
| This proof depends on syntax axioms:
|
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-io 721 |
| This proof depends on definitions: df-bi 117 |
| This theorem is used by: oibabs 726 pm1.4 739 olci 744 pm2.07 749 pm2.46 751 biorf 756 pm1.5 777 pm2.41 788 pm4.78i 794 pm3.48 797 ordi 828 andi 830 pm4.72 839 stdcn 859 pm2.54dc 903 pm2.85dc 917 dcor 948 dedlemb 983 anifpdc 999 xoranor 1426 19.33 1537 hbor 1599 nford 1620 19.30dc 1680 19.43 1681 19.32r 1732 euor2 2145 mooran2 2160 r19.32r 2697 undif3ss 3492 undif4 3587 issod 4466 onsucelsucexmid 4679 sucprcreg 4698 0elnn 4768 acexmidlemph 6081 nntri3or 6770 swoord1 6840 swoord2 6841 exmidaclem 7570 exmidontri2or 7608 addlocprlem 7908 nqprloc 7918 apreap 8923 zletric 9699 zlelttric 9700 zmulcl 9709 zdceq 9731 zdcle 9732 zdclt 9733 nn0lt2 9738 elnn1uz2 10023 mnflt 10202 mnfltpnf 10204 xrltso 10215 fzdcel 10461 fzm1 10524 qletric 10693 qlelttric 10694 qdceq 10696 qdclt 10697 qsqeqor 11108 zzlesq 11167 nn0o1gt2 12697 prm23lt5 13071 gausslemma2dlem0f 16378 umgrupgr 16558 umgrislfupgrenlem 16576 usgruspgr 16629 konigsbergssiedgwen 16932 bj-fadc 16987 decidin 17030 triap 17284 tridceq 17313 |
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