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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 398. (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 962 | . 2 wff (𝜑 ∧ 𝜓 ∧ 𝜒) |
5 | 1, 2 | wa 103 | . . 3 wff (𝜑 ∧ 𝜓) |
6 | 5, 3 | wa 103 | . 2 wff ((𝜑 ∧ 𝜓) ∧ 𝜒) |
7 | 4, 6 | wb 104 | 1 wff ((𝜑 ∧ 𝜓 ∧ 𝜒) ↔ ((𝜑 ∧ 𝜓) ∧ 𝜒)) |
Colors of variables: wff set class |
This definition is referenced by: 3anass 966 3anrot 967 3ancoma 969 3anan32 973 3ioran 977 3simpa 978 3pm3.2i 1159 pm3.2an3 1160 3jca 1161 3anbi123i 1170 3imp 1175 3anbi123d 1290 3anim123d 1297 an6 1299 19.26-3an 1459 hb3an 1529 nf3an 1545 nf3and 1548 eeeanv 1905 sb3an 1931 mopick2 2082 r19.26-3 2562 3reeanv 2601 ceqsex3v 2728 ceqsex4v 2729 ceqsex8v 2731 sbc3an 2970 elin3 3267 raltpg 3576 tpss 3685 dfopg 3703 opeq1 3705 opeq2 3706 opm 4156 otth2 4163 poirr 4229 po3nr 4232 wepo 4281 wetrep 4282 rabxp 4576 brinxp2 4606 brinxp 4607 sotri2 4936 sotri3 4937 f1orn 5377 dff1o6 5677 isosolem 5725 oprabid 5803 caovimo 5964 elovmpo 5971 dfxp3 6092 nnaord 6405 fiintim 6817 prmuloc 7374 ltrelxr 7825 rexuz2 9376 ltxr 9562 elixx3g 9684 elioo4g 9717 elioopnf 9750 elioomnf 9751 elicopnf 9752 elxrge0 9761 divelunit 9785 elfz2 9797 elfzuzb 9800 uzsplit 9872 fznn0 9893 elfzmlbp 9909 elfzo2 9927 fzolb2 9931 fzouzsplit 9956 ssfzo12bi 10002 fzind2 10016 abs2dif 10878 sumeq2 11128 divalgb 11622 divgcdz 11660 rplpwr 11715 cncongr1 11784 isbasis3g 12213 lmfval 12361 lmbr 12382 lmbr2 12383 xmeterval 12604 xmeter 12605 cnbl0 12703 cnblcld 12704 limcrcl 12796 bd3an 13028 |
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