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| Mirrors > Home > ILE Home > Th. List > biantrurd | GIF version | ||
| Description: A wff is equivalent to its conjunction with truth. (Contributed by NM, 1-May-1995.) (Proof shortened by Andrew Salmon, 7-May-2011.) |
| Ref | Expression |
|---|---|
| biantrud.1 | ⊢ (𝜑 → 𝜓) |
| Ref | Expression |
|---|---|
| biantrurd | ⊢ (𝜑 → (𝜒 ↔ (𝜓 ∧ 𝜒))) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | biantrud.1 | . 2 ⊢ (𝜑 → 𝜓) | |
| 2 | ibar 301 | . 2 ⊢ (𝜓 → (𝜒 ↔ (𝜓 ∧ 𝜒))) | |
| 3 | 1, 2 | syl 14 | 1 ⊢ (𝜑 → (𝜒 ↔ (𝜓 ∧ 𝜒))) |
| Colors of variables: wff set class |
| This proof depends on syntax axioms: → wi 4 ∧ wa 104 ↔ wb 105 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia2 107 ax-ia3 108 |
| This proof depends on definitions: df-bi 117 |
| This theorem is used by: mpbirand 445 3anibar 1196 3biant1d 1396 drex1 1851 elrab3t 2981 eldifvsn 3847 bnd2 4312 opbrop 4856 opelresi 5076 funcnv3 5446 fnssresb 5498 dff1o5 5651 fneqeql2 5821 fnniniseg2 5835 dffo3 5858 fmptco 5877 fnressn 5904 fconst4m 5938 riota2df 6063 eloprabga 6178 suppimacnvfn 6490 mptsuppd 6500 suppssrst 6505 suppssrgst 6506 frecabcl 6674 mptelixpg 7020 relresfin 7268 exmidfodomrlemreseldju 7558 enq0breq 7809 genpassl 7897 genpassu 7898 elnnnn0 9617 peano2z 9691 znnsub 9707 znn0sub 9721 uzin 9971 nn01to3 10033 rpnegap 10104 negelrp 10105 xsubge0 10300 divelunit 10421 elfz5 10437 uzsplit 10516 elfzonelfzo 10665 infssuzex 10683 adddivflid 10748 divfl0 10752 hashfibclem 11304 hashf1lem1 11307 swrdspsleq 11461 2shfti 11618 rexuz3 11778 clim2c 12075 fisumss 12184 bitsmod 12748 bitscmp 12750 bezoutlemmain 12800 nninfctlemfo 12842 dvdsfi 13046 pc2dvds 13138 1arith 13175 xpsfrnel 13724 xpsfrnel2 13726 ghmeqker 14133 lsslss 14827 zndvds 15093 znleval2 15098 eltg3 15283 lmbrf 15441 cnrest2 15462 cnptoprest 15465 cnptoprest2 15466 ismet2 15580 elbl2ps 15618 elbl2 15619 xblpnfps 15624 xblpnf 15625 bdxmet 15727 metcn 15740 cnbl0 15760 cnblcld 15761 mulc1cncf 15815 ellimc3apf 15886 pilem1 16006 wilthlem1 16232 bposlem1 16311 lgsdilem 16351 lgsne0 16362 lgsabs1 16363 lgsquadlem1 16401 lgsquadlem2 16402 isclwwlknx 16862 clwwlkn1 16864 |
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