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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 4338 issod 4464 elelsuc 4554 ordtri2or2exmidlem 4673 regexmidlem1 4680 fununmo 5423 nndceq 6772 nndcel 6773 swoord1 6836 swoord2 6837 exmidontri2or 7602 addlocprlem 7902 msqge0 8944 mulge0 8947 ltleap 8960 nn1m1nn 9322 elnnz 9654 zletric 9688 zlelttric 9689 zmulcl 9698 zdceq 9720 zdcle 9721 zdclt 9722 ltpnf 10182 xrlttri3 10199 xrpnfdc 10244 xrmnfdc 10245 fzdcel 10444 qletric 10676 qlelttric 10677 qdceq 10679 qdclt 10680 qsqeqor 11087 hashfiv01gt1 11221 isum 12152 iprodap 12347 iprodap0 12349 nn0o1gt2 12672 prm23lt5 13042 4sqlem17 13186 gausslemma2dlem0f 16173 bj-trdc 16780 bj-nn0suc0 16976 triap 17078 tridceq 17106 |
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