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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 | ⊢ (𝜑 → (𝜑 ∨ 𝜓)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | id 19 | . . 3 ⊢ ((𝜑 ∨ 𝜓) → (𝜑 ∨ 𝜓)) | |
| 2 | jaob 718 | . . 3 ⊢ (((𝜑 ∨ 𝜓) → (𝜑 ∨ 𝜓)) ↔ ((𝜑 → (𝜑 ∨ 𝜓)) ∧ (𝜓 → (𝜑 ∨ 𝜓)))) | |
| 3 | 1, 2 | mpbi 145 | . 2 ⊢ ((𝜑 → (𝜑 ∨ 𝜓)) ∧ (𝜓 → (𝜑 ∨ 𝜓))) |
| 4 | 3 | simpli 111 | 1 ⊢ (𝜑 → (𝜑 ∨ 𝜓)) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∧ wa 104 ∨ wo 716 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-io 717 |
| This theorem depends on definitions: df-bi 117 |
| This theorem is referenced by: pm2.67-2 721 pm1.4 735 orci 739 orcd 741 orcs 743 pm2.45 746 biorfi 754 pm1.5 773 pm2.4 786 pm4.44 787 pm4.78i 790 pm4.45 792 pm3.48 793 pm2.76 816 orabs 822 ordi 824 andi 826 pm4.72 835 biort 837 dcim 849 pm2.54dc 899 pm2.85dc 913 dcor 944 pm5.71dc 970 dedlema 978 3mix1 1193 xoranor 1422 19.33 1533 hbor 1595 nford 1616 19.30dc 1676 19.43 1677 19.32r 1728 moor 2151 r19.32r 2680 ssun1 3372 undif3ss 3470 reuun1 3491 prmg 3798 opthpr 3860 exmidn0m 4297 issod 4422 elelsuc 4512 ordtri2or2exmidlem 4630 regexmidlem1 4637 fununmo 5379 nndceq 6710 nndcel 6711 swoord1 6774 swoord2 6775 exmidontri2or 7504 addlocprlem 7798 msqge0 8839 mulge0 8842 ltleap 8855 nn1m1nn 9204 elnnz 9532 zletric 9566 zlelttric 9567 zmulcl 9576 zdceq 9598 zdcle 9599 zdclt 9600 ltpnf 10058 xrlttri3 10075 xrpnfdc 10120 xrmnfdc 10121 fzdcel 10318 qletric 10545 qlelttric 10546 qdceq 10548 qdclt 10549 qsqeqor 10956 hashfiv01gt1 11088 isum 12007 iprodap 12202 iprodap0 12204 nn0o1gt2 12527 prm23lt5 12897 4sqlem17 13041 gausslemma2dlem0f 15853 bj-trdc 16450 bj-nn0suc0 16646 triap 16741 tridceq 16769 |
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