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Mirrors > Home > ILE Home > Th. List > df-3an | GIF version |
Description: Define conjunction ('and') of 3 wff.s. Definition *4.34 of [WhiteheadRussell] p. 118. This abbreviation reduces the number of parentheses and emphasizes that the order of bracketing is not important by virtue of the associative law anass 401. (Contributed by NM, 8-Apr-1994.) |
Ref | Expression |
---|---|
df-3an | ⊢ ((𝜑 ∧ 𝜓 ∧ 𝜒) ↔ ((𝜑 ∧ 𝜓) ∧ 𝜒)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | wph | . . 3 wff 𝜑 | |
2 | wps | . . 3 wff 𝜓 | |
3 | wch | . . 3 wff 𝜒 | |
4 | 1, 2, 3 | w3a 978 | . 2 wff (𝜑 ∧ 𝜓 ∧ 𝜒) |
5 | 1, 2 | wa 104 | . . 3 wff (𝜑 ∧ 𝜓) |
6 | 5, 3 | wa 104 | . 2 wff ((𝜑 ∧ 𝜓) ∧ 𝜒) |
7 | 4, 6 | wb 105 | 1 wff ((𝜑 ∧ 𝜓 ∧ 𝜒) ↔ ((𝜑 ∧ 𝜓) ∧ 𝜒)) |
Colors of variables: wff set class |
This definition is referenced by: 3anass 982 3anrot 983 3ancoma 985 3anan32 989 3ioran 993 3simpa 994 3pm3.2i 1175 pm3.2an3 1176 3jca 1177 3anbi123i 1188 3imp 1193 3anbi123d 1312 3anim123d 1319 an6 1321 19.26-3an 1483 hb3an 1550 nf3an 1566 nf3and 1569 eeeanv 1933 sb3an 1958 mopick2 2109 r19.26-3 2607 3reeanv 2647 ceqsex3v 2779 ceqsex4v 2780 ceqsex8v 2782 sbc3an 3024 elin3 3326 rexdifpr 3620 raltpg 3645 tpss 3757 dfopg 3775 opeq1 3777 opeq2 3778 opm 4232 otth2 4239 poirr 4305 po3nr 4308 wepo 4357 wetrep 4358 rabxp 4661 brinxp2 4691 brinxp 4692 sotri2 5023 sotri3 5024 f1orn 5468 dff1o6 5772 isosolem 5820 oprabid 5902 caovimo 6063 elovmpo 6067 dfxp3 6190 nnaord 6505 fiintim 6923 prmuloc 7560 ltrelxr 8012 rexuz2 9575 ltxr 9769 elixx3g 9895 elioo4g 9928 elioopnf 9961 elioomnf 9962 elicopnf 9963 elxrge0 9972 divelunit 9996 elfz2 10009 elfzuzb 10012 uzsplit 10085 fznn0 10106 elfzmlbp 10125 elfzo2 10143 fzolb2 10147 fzouzsplit 10172 ssfzo12bi 10218 fzind2 10232 dfrp2 10257 abs2dif 11106 sumeq2 11358 divalgb 11920 divgcdz 11962 rplpwr 12018 nnwosdc 12030 cncongr1 12093 pythagtriplem2 12256 pythagtrip 12273 issubm2 12792 issubg3 12978 resgrpisgrp 12981 ringpropd 13117 isbasis3g 13326 lmfval 13474 lmbr 13495 lmbr2 13496 xmeterval 13717 xmeter 13718 cnbl0 13816 cnblcld 13817 limcrcl 13909 bd3an 14353 |
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