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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 717 | . . 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 715 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-io 716 |
| This theorem depends on definitions: df-bi 117 |
| This theorem is referenced by: pm2.67-2 720 pm1.4 734 orci 738 orcd 740 orcs 742 pm2.45 745 biorfi 753 pm1.5 772 pm2.4 785 pm4.44 786 pm4.78i 789 pm4.45 791 pm3.48 792 pm2.76 815 orabs 821 ordi 823 andi 825 pm4.72 834 biort 836 dcim 848 pm2.54dc 898 pm2.85dc 912 dcor 943 pm5.71dc 969 dedlema 977 3mix1 1192 xoranor 1421 19.33 1532 hbor 1594 nford 1615 19.30dc 1675 19.43 1676 19.32r 1728 moor 2151 r19.32r 2679 ssun1 3370 undif3ss 3468 reuun1 3489 prmg 3794 opthpr 3855 exmidn0m 4291 issod 4416 elelsuc 4506 ordtri2or2exmidlem 4624 regexmidlem1 4631 fununmo 5372 nndceq 6667 nndcel 6668 swoord1 6731 swoord2 6732 exmidontri2or 7461 addlocprlem 7755 msqge0 8796 mulge0 8799 ltleap 8812 nn1m1nn 9161 elnnz 9489 zletric 9523 zlelttric 9524 zmulcl 9533 zdceq 9555 zdcle 9556 zdclt 9557 ltpnf 10015 xrlttri3 10032 xrpnfdc 10077 xrmnfdc 10078 fzdcel 10275 qletric 10502 qlelttric 10503 qdceq 10505 qdclt 10506 qsqeqor 10913 hashfiv01gt1 11045 isum 11951 iprodap 12146 iprodap0 12148 nn0o1gt2 12471 prm23lt5 12841 4sqlem17 12985 gausslemma2dlem0f 15789 bj-trdc 16374 bj-nn0suc0 16571 triap 16659 tridceq 16686 |
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