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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 722 | . . 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 |
| 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-io 721 |
| This proof depends on definitions: df-bi 117 |
| This theorem is used by: pm2.67-2 725 pm1.4 739 orci 743 orcd 745 orcs 747 pm2.45 750 biorfi 758 pm1.5 777 pm2.4 790 pm4.44 791 pm4.78i 794 pm4.45 796 pm3.48 797 pm2.76 820 orabs 826 ordi 828 andi 830 pm4.72 839 biort 841 dcim 853 pm2.54dc 903 pm2.85dc 917 dcor 948 pm5.71dc 974 dedlema 982 3mix1 1197 xoranor 1426 19.33 1537 hbor 1599 nford 1620 19.30dc 1680 19.43 1681 19.32r 1732 moor 2158 r19.32r 2697 ssun1 3392 undif3ss 3492 reuun1 3515 prmg 3835 opthpr 3897 exmidn0m 4338 issod 4464 elelsuc 4554 ordtri2or2exmidlem 4673 regexmidlem1 4680 fununmo 5423 nndceq 6772 nndcel 6773 swoord1 6836 swoord2 6837 exmidontri2or 7602 addlocprlem 7902 msqge0 8945 mulge0 8948 ltleap 8961 nn1m1nn 9323 elnnz 9656 zletric 9690 zlelttric 9691 zmulcl 9700 zdceq 9722 zdcle 9723 zdclt 9724 ltpnf 10184 xrlttri3 10201 xrpnfdc 10246 xrmnfdc 10247 fzdcel 10446 qletric 10678 qlelttric 10679 qdceq 10681 qdclt 10682 qsqeqor 11089 hashfiv01gt1 11223 isum 12154 iprodap 12349 iprodap0 12351 nn0o1gt2 12674 prm23lt5 13044 4sqlem17 13188 gausslemma2dlem0f 16185 bj-trdc 16792 bj-nn0suc0 16988 triap 17090 tridceq 17118 |
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