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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 399. (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 968 | . 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 972 3anrot 973 3ancoma 975 3anan32 979 3ioran 983 3simpa 984 3pm3.2i 1165 pm3.2an3 1166 3jca 1167 3anbi123i 1178 3imp 1183 3anbi123d 1302 3anim123d 1309 an6 1311 19.26-3an 1471 hb3an 1538 nf3an 1554 nf3and 1557 eeeanv 1921 sb3an 1946 mopick2 2097 r19.26-3 2595 3reeanv 2635 ceqsex3v 2767 ceqsex4v 2768 ceqsex8v 2770 sbc3an 3011 elin3 3312 rexdifpr 3603 raltpg 3628 tpss 3737 dfopg 3755 opeq1 3757 opeq2 3758 opm 4211 otth2 4218 poirr 4284 po3nr 4287 wepo 4336 wetrep 4337 rabxp 4640 brinxp2 4670 brinxp 4671 sotri2 5000 sotri3 5001 f1orn 5441 dff1o6 5743 isosolem 5791 oprabid 5870 caovimo 6031 elovmpo 6038 dfxp3 6159 nnaord 6473 fiintim 6890 prmuloc 7503 ltrelxr 7955 rexuz2 9515 ltxr 9707 elixx3g 9833 elioo4g 9866 elioopnf 9899 elioomnf 9900 elicopnf 9901 elxrge0 9910 divelunit 9934 elfz2 9947 elfzuzb 9950 uzsplit 10023 fznn0 10044 elfzmlbp 10063 elfzo2 10081 fzolb2 10085 fzouzsplit 10110 ssfzo12bi 10156 fzind2 10170 dfrp2 10195 abs2dif 11044 sumeq2 11296 divalgb 11858 divgcdz 11900 rplpwr 11956 nnwosdc 11968 cncongr1 12031 pythagtriplem2 12194 pythagtrip 12211 isbasis3g 12644 lmfval 12792 lmbr 12813 lmbr2 12814 xmeterval 13035 xmeter 13036 cnbl0 13134 cnblcld 13135 limcrcl 13227 bd3an 13672 |
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