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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 393. (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 919 | . 2 wff (𝜑 ∧ 𝜓 ∧ 𝜒) |
5 | 1, 2 | wa 102 | . . 3 wff (𝜑 ∧ 𝜓) |
6 | 5, 3 | wa 102 | . 2 wff ((𝜑 ∧ 𝜓) ∧ 𝜒) |
7 | 4, 6 | wb 103 | 1 wff ((𝜑 ∧ 𝜓 ∧ 𝜒) ↔ ((𝜑 ∧ 𝜓) ∧ 𝜒)) |
Colors of variables: wff set class |
This definition is referenced by: 3anass 923 3anrot 924 3ancoma 926 3anan32 930 3ioran 934 3simpa 935 3pm3.2i 1116 pm3.2an3 1117 3jca 1118 3anbi123i 1127 3imp 1132 3anbi123d 1243 3anim123d 1250 an6 1252 19.26-3an 1412 hb3an 1482 nf3an 1498 nf3and 1501 eeeanv 1849 sb3an 1873 mopick2 2024 r19.26-3 2487 3reeanv 2524 ceqsex3v 2641 ceqsex4v 2642 ceqsex8v 2644 sbc3an 2875 elin3 3157 raltpg 3445 tpss 3550 dfopg 3568 opeq1 3570 opeq2 3571 opm 3989 otth2 3996 poirr 4062 po3nr 4065 wepo 4114 wetrep 4115 rabxp 4398 brinxp2 4425 brinxp 4426 sotri2 4742 sotri3 4743 f1orn 5156 dff1o6 5436 isosolem 5483 oprabid 5557 caovimo 5714 elovmpt2 5721 dfxp3 5840 nnaord 6105 prmuloc 6756 ltrelxr 7173 rexuz2 8669 ltxr 8849 elixx3g 8924 elioo4g 8957 elioopnf 8990 elioomnf 8991 elicopnf 8992 elxrge0 9001 divelunit 9024 elfz2 9036 elfzuzb 9039 uzsplit 9109 fznn0 9129 elfzmlbp 9143 elfzo2 9160 fzolb2 9163 fzouzsplit 9188 ssfzo12bi 9234 fzind2 9248 abs2dif 9992 divalgb 10325 divgcdz 10363 rplpwr 10416 cncongr1 10485 bd3an 10621 |
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