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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 |
| Syntax hints: → wi 4 ∧ wa 104 ∨ wo 720 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-io 721 |
| This theorem depends on definitions: df-bi 117 |
| This theorem is referenced 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 3833 opthpr 3895 exmidn0m 4336 issod 4462 elelsuc 4552 ordtri2or2exmidlem 4671 regexmidlem1 4678 fununmo 5421 nndceq 6766 nndcel 6767 swoord1 6830 swoord2 6831 exmidontri2or 7596 addlocprlem 7896 msqge0 8938 mulge0 8941 ltleap 8954 nn1m1nn 9305 elnnz 9637 zletric 9671 zlelttric 9672 zmulcl 9681 zdceq 9703 zdcle 9704 zdclt 9705 ltpnf 10165 xrlttri3 10182 xrpnfdc 10227 xrmnfdc 10228 fzdcel 10427 qletric 10659 qlelttric 10660 qdceq 10662 qdclt 10663 qsqeqor 11070 hashfiv01gt1 11204 isum 12135 iprodap 12330 iprodap0 12332 nn0o1gt2 12655 prm23lt5 13025 4sqlem17 13169 gausslemma2dlem0f 16156 bj-trdc 16763 bj-nn0suc0 16959 triap 17052 tridceq 17080 |
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