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| Description: Introduction of a disjunct. Axiom *1.3 of [WhiteheadRussell] p. 96. (Contributed by NM, 30-Aug-1993.) (Revised by NM, 31-Jan-2015.) |
| Ref | Expression |
|---|---|
| olc | ⊢ (𝜑 → (𝜓 ∨ 𝜑)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | id 19 | . . 3 ⊢ ((𝜓 ∨ 𝜑) → (𝜓 ∨ 𝜑)) | |
| 2 | jaob 722 | . . 3 ⊢ (((𝜓 ∨ 𝜑) → (𝜓 ∨ 𝜑)) ↔ ((𝜓 → (𝜓 ∨ 𝜑)) ∧ (𝜑 → (𝜓 ∨ 𝜑)))) | |
| 3 | 1, 2 | mpbi 145 | . 2 ⊢ ((𝜓 → (𝜓 ∨ 𝜑)) ∧ (𝜑 → (𝜓 ∨ 𝜑))) |
| 4 | 3 | simpri 113 | 1 ⊢ (𝜑 → (𝜓 ∨ 𝜑)) |
| Colors of variables: wff set class |
| This proof depends on syntax axioms: → wi 4 ∧ wa 104 ∨ wo 720 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-io 721 |
| This proof depends on definitions: df-bi 117 |
| This theorem is used by: oibabs 726 pm1.4 739 olci 744 pm2.07 749 pm2.46 751 biorf 756 pm1.5 777 pm2.41 788 pm4.78i 794 pm3.48 797 ordi 828 andi 830 pm4.72 839 stdcn 859 pm2.54dc 903 pm2.85dc 917 dcor 948 dedlemb 983 anifpdc 999 xoranor 1426 19.33 1537 hbor 1599 nford 1620 19.30dc 1680 19.43 1681 19.32r 1732 euor2 2145 mooran2 2160 r19.32r 2697 undif3ss 3492 undif4 3587 issod 4466 onsucelsucexmid 4679 sucprcreg 4698 0elnn 4768 acexmidlemph 6081 nntri3or 6771 swoord1 6841 swoord2 6842 exmidaclem 7570 exmidontri2or 7608 addlocprlem 7908 nqprloc 7918 apreap 8923 zletric 9697 zlelttric 9698 zmulcl 9707 zdceq 9729 zdcle 9730 zdclt 9731 nn0lt2 9736 elnn1uz2 10022 mnflt 10201 mnfltpnf 10203 xrltso 10214 fzdcel 10460 fzm1 10523 qletric 10692 qlelttric 10693 qdceq 10695 qdclt 10696 qsqeqor 11107 zzlesq 11166 nn0o1gt2 12696 prm23lt5 13070 gausslemma2dlem0f 16395 umgrupgr 16575 umgrislfupgrenlem 16593 usgruspgr 16646 konigsbergssiedgwen 16949 bj-fadc 17004 decidin 17047 triap 17301 tridceq 17330 |
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