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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 2152 r19.32r 2689 ssun1 3381 undif3ss 3481 reuun1 3502 prmg 3813 opthpr 3875 exmidn0m 4313 issod 4439 elelsuc 4529 ordtri2or2exmidlem 4647 regexmidlem1 4654 fununmo 5397 nndceq 6731 nndcel 6732 swoord1 6795 swoord2 6796 exmidontri2or 7552 addlocprlem 7849 msqge0 8889 mulge0 8892 ltleap 8905 nn1m1nn 9254 elnnz 9586 zletric 9620 zlelttric 9621 zmulcl 9630 zdceq 9652 zdcle 9653 zdclt 9654 ltpnf 10112 xrlttri3 10129 xrpnfdc 10174 xrmnfdc 10175 fzdcel 10373 qletric 10600 qlelttric 10601 qdceq 10603 qdclt 10604 qsqeqor 11011 hashfiv01gt1 11143 isum 12067 iprodap 12262 iprodap0 12264 nn0o1gt2 12587 prm23lt5 12957 4sqlem17 13101 gausslemma2dlem0f 15919 bj-trdc 16516 bj-nn0suc0 16712 triap 16805 tridceq 16833 |
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