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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 4340 issod 4466 elelsuc 4556 ordtri2or2exmidlem 4675 regexmidlem1 4682 fununmo 5426 nndceq 6776 nndcel 6777 swoord1 6840 swoord2 6841 exmidontri2or 7609 addlocprlem 7909 msqge0 8953 mulge0 8956 ltleap 8969 nn1m1nn 9332 elnnz 9666 zletric 9700 zlelttric 9701 zmulcl 9710 zdceq 9732 zdcle 9733 zdclt 9734 ltpnf 10200 xrlttri3 10217 xrpnfdc 10262 xrmnfdc 10263 fzdcel 10462 qletric 10694 qlelttric 10695 qdceq 10697 qdclt 10698 qsqeqor 11109 hashfiv01gt1 11244 isum 12178 iprodap 12373 iprodap0 12375 nn0o1gt2 12698 prm23lt5 13072 4sqlem17 13216 gsummptfidmsplit 14255 ppiprm 16271 ppidif 16281 gausslemma2dlem0f 16390 bj-trdc 16997 bj-nn0suc0 17193 triap 17296 tridceq 17325 |
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