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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 8917 zletric 9692 zlelttric 9693 zmulcl 9702 zdceq 9724 zdcle 9725 zdclt 9726 nn0lt2 9731 elnn1uz2 10016 mnflt 10195 mnfltpnf 10197 xrltso 10208 fzdcel 10454 fzm1 10517 qletric 10686 qlelttric 10687 qdceq 10689 qdclt 10690 qsqeqor 11100 zzlesq 11159 nn0o1gt2 12688 prm23lt5 13062 gausslemma2dlem0f 16271 umgrupgr 16451 umgrislfupgrenlem 16469 usgruspgr 16522 konigsbergssiedgwen 16825 bj-fadc 16880 decidin 16923 triap 17176 tridceq 17204 |
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