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| Mirrors > Home > MPE Home > Th. List > ifboth | Structured version Visualization version GIF version | ||
| Description: A wff 𝜃 containing a conditional operator is true when both of its cases are true. (Contributed by NM, 3-Sep-2006.) (Revised by Mario Carneiro, 15-Feb-2015.) |
| Ref | Expression |
|---|---|
| ifboth.1 | ⊢ (𝐴 = if(𝜑, 𝐴, 𝐵) → (𝜓 ↔ 𝜃)) |
| ifboth.2 | ⊢ (𝐵 = if(𝜑, 𝐴, 𝐵) → (𝜒 ↔ 𝜃)) |
| Ref | Expression |
|---|---|
| ifboth | ⊢ ((𝜓 ∧ 𝜒) → 𝜃) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ifboth.1 | . 2 ⊢ (𝐴 = if(𝜑, 𝐴, 𝐵) → (𝜓 ↔ 𝜃)) | |
| 2 | ifboth.2 | . 2 ⊢ (𝐵 = if(𝜑, 𝐴, 𝐵) → (𝜒 ↔ 𝜃)) | |
| 3 | simpll 779 | . 2 ⊢ (((𝜓 ∧ 𝜒) ∧ 𝜑) → 𝜓) | |
| 4 | simplr 781 | . 2 ⊢ (((𝜓 ∧ 𝜒) ∧ ¬ 𝜑) → 𝜒) | |
| 5 | 1, 2, 3, 4 | ifbothda 4524 | 1 ⊢ ((𝜓 ∧ 𝜒) → 𝜃) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ¬ wn 3 → wi 4 ↔ wb 209 ∧ wa 401 = wceq 1570 ifcif 4485 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1945 ax-6 2002 ax-7 2043 ax-8 2149 ax-9 2157 ax-ext 2735 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-ex 1813 df-sb 2102 df-clab 2742 df-cleq 2755 df-clel 2839 df-if 4486 |
| This theorem is used by: ifcl 4531 keephyp 4557 soltmin 6142 xrmaxlt 13338 xrltmin 13339 xrmaxle 13340 xrlemin 13341 ifle 13354 expmulnbnd 14406 limsupgre 15677 isumless 16043 cvgrat 16081 rpnnen2lem4 16414 ruclem2 16429 sadcaddlem 16656 sadadd3 16660 pcmptdvds 17101 prmreclem5 17127 prmreclem6 17128 pnfnei 23568 mnfnei 23569 xkopt 24004 xmetrtri2 24705 stdbdxmet 24864 stdbdmet 24865 stdbdmopn 24867 xrsxmet 25159 icccmplem2 25173 metdscn 25206 metnrmlem1a 25208 ivthlem2 25803 ovolicc2lem5 25872 ioombl1lem1 25909 ioombl1lem4 25912 ismbfd 25990 mbfi1fseqlem4 26069 mbfi1fseqlem5 26070 itg2const 26091 itg2const2 26092 itg2monolem3 26103 itg2gt0 26111 itg2cnlem1 26112 itg2cnlem2 26113 iblss 26155 itgless 26167 ibladdlem 26170 iblabsr 26180 iblmulc2 26181 bddiblnc 26192 dvferm1lem 26334 dvferm2lem 26336 dvlip2 26345 dgradd2 26617 plydiveu 26649 chtppilim 27832 dchrvmasumiflem1 27858 ostth3 27995 1smat1 34506 poimirlem24 38754 mblfinlem2 38768 itg2addnclem 38781 itg2addnc 38784 itg2gt0cn 38785 ibladdnclem 38786 iblmulc2nc 38795 ftc1anclem5 38807 ftc1anclem8 38810 ftc1anc 38811 |
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