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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 4464 onsucelsucexmid 4677 sucprcreg 4696 0elnn 4766 acexmidlemph 6078 nntri3or 6766 swoord1 6836 swoord2 6837 exmidaclem 7565 exmidontri2or 7603 addlocprlem 7903 nqprloc 7913 apreap 8918 zletric 9693 zlelttric 9694 zmulcl 9703 zdceq 9725 zdcle 9726 zdclt 9727 nn0lt2 9732 elnn1uz2 10017 mnflt 10196 mnfltpnf 10198 xrltso 10209 fzdcel 10455 fzm1 10518 qletric 10687 qlelttric 10688 qdceq 10690 qdclt 10691 qsqeqor 11102 zzlesq 11161 nn0o1gt2 12691 prm23lt5 13065 gausslemma2dlem0f 16339 umgrupgr 16519 umgrislfupgrenlem 16537 usgruspgr 16590 konigsbergssiedgwen 16893 bj-fadc 16948 decidin 16991 triap 17244 tridceq 17273 |
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