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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 8946 mulge0 8949 ltleap 8962 nn1m1nn 9324 elnnz 9658 zletric 9692 zlelttric 9693 zmulcl 9702 zdceq 9724 zdcle 9725 zdclt 9726 ltpnf 10192 xrlttri3 10209 xrpnfdc 10254 xrmnfdc 10255 fzdcel 10454 qletric 10686 qlelttric 10687 qdceq 10689 qdclt 10690 qsqeqor 11100 hashfiv01gt1 11235 isum 12168 iprodap 12363 iprodap0 12365 nn0o1gt2 12688 prm23lt5 13062 4sqlem17 13206 ppiprm 16170 ppidif 16175 gausslemma2dlem0f 16271 bj-trdc 16878 bj-nn0suc0 17074 triap 17176 tridceq 17204 |
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