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| Description: Introduction of a disjunct. Theorem *2.2 of [WhiteheadRussell] p. 104. (Contributed by NM, 30-Aug-1993.) (Revised by NM, 31-Jan-2015.) |
| Ref | Expression |
|---|---|
| orc |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | id 19 |
. . 3
| |
| 2 | jaob 722 |
. . 3
| |
| 3 | 1, 2 | mpbi 145 |
. 2
|
| 4 | 3 | simpli 111 |
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-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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