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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 7603 addlocprlem 7903 msqge0 8947 mulge0 8950 ltleap 8963 nn1m1nn 9325 elnnz 9659 zletric 9693 zlelttric 9694 zmulcl 9703 zdceq 9725 zdcle 9726 zdclt 9727 ltpnf 10193 xrlttri3 10210 xrpnfdc 10255 xrmnfdc 10256 fzdcel 10455 qletric 10687 qlelttric 10688 qdceq 10690 qdclt 10691 qsqeqor 11101 hashfiv01gt1 11236 isum 12170 iprodap 12365 iprodap0 12367 nn0o1gt2 12690 prm23lt5 13064 4sqlem17 13208 ppiprm 16181 ppidif 16191 gausslemma2dlem0f 16295 bj-trdc 16902 bj-nn0suc0 17098 triap 17200 tridceq 17228 |
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