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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 2154 r19.32r 2691 ssun1 3386 undif3ss 3486 reuun1 3507 prmg 3819 opthpr 3881 exmidn0m 4319 issod 4445 elelsuc 4535 ordtri2or2exmidlem 4653 regexmidlem1 4660 fununmo 5403 nndceq 6745 nndcel 6746 swoord1 6809 swoord2 6810 exmidontri2or 7566 addlocprlem 7866 msqge0 8908 mulge0 8911 ltleap 8924 nn1m1nn 9275 elnnz 9607 zletric 9641 zlelttric 9642 zmulcl 9651 zdceq 9673 zdcle 9674 zdclt 9675 ltpnf 10135 xrlttri3 10152 xrpnfdc 10197 xrmnfdc 10198 fzdcel 10397 qletric 10628 qlelttric 10629 qdceq 10631 qdclt 10632 qsqeqor 11039 hashfiv01gt1 11173 isum 12100 iprodap 12295 iprodap0 12297 nn0o1gt2 12620 prm23lt5 12990 4sqlem17 13134 gausslemma2dlem0f 16057 bj-trdc 16664 bj-nn0suc0 16860 triap 16953 tridceq 16981 |
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