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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 8907 mulge0 8910 ltleap 8923 nn1m1nn 9272 elnnz 9604 zletric 9638 zlelttric 9639 zmulcl 9648 zdceq 9670 zdcle 9671 zdclt 9672 ltpnf 10132 xrlttri3 10149 xrpnfdc 10194 xrmnfdc 10195 fzdcel 10394 qletric 10625 qlelttric 10626 qdceq 10628 qdclt 10629 qsqeqor 11036 hashfiv01gt1 11170 isum 12096 iprodap 12291 iprodap0 12293 nn0o1gt2 12616 prm23lt5 12986 4sqlem17 13130 gausslemma2dlem0f 16039 bj-trdc 16636 bj-nn0suc0 16832 triap 16925 tridceq 16953 |
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