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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 7564 exmidontri2or 7602 addlocprlem 7902 nqprloc 7912 apreap 8915 zletric 9688 zlelttric 9689 zmulcl 9698 zdceq 9720 zdcle 9721 zdclt 9722 nn0lt2 9727 elnn1uz2 10007 mnflt 10185 mnfltpnf 10187 xrltso 10198 fzdcel 10444 fzm1 10507 qletric 10676 qlelttric 10677 qdceq 10679 qdclt 10680 qsqeqor 11087 zzlesq 11146 nn0o1gt2 12672 prm23lt5 13042 gausslemma2dlem0f 16173 umgrupgr 16353 umgrislfupgrenlem 16371 usgruspgr 16424 konigsbergssiedgwen 16727 bj-fadc 16782 decidin 16825 triap 17078 tridceq 17106 |
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