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| 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 441. |
| Ref | Expression |
|---|---|
| df-3an |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | wph |
. . 3
| |
| 2 | wps |
. . 3
| |
| 3 | wch |
. . 3
| |
| 4 | 1, 2, 3 | w3a 781 |
. 2
|
| 5 | 1, 2 | wa 221 |
. . 3
|
| 6 | 5, 3 | wa 221 |
. 2
|
| 7 | 4, 6 | wb 144 |
1
|
| Colors of variables: wff set class |
| This definition is referenced by: 3anass 785 3anrot 786 3ancoma 788 3simpa 791 3pm3.2i 824 3jca 825 3anim123i 827 3anbi123i 828 3imp 833 3exp 838 3anbi123d 899 3anim123d 906 an6 908 hb3an 1048 sb3an 1275 sbc3ang 2027 otthg 2866 poirr 2923 po3nr 2926 wefrc 2970 dfwe2 3140 brinxp 3318 f1orn 3806 dff1o6 3991 ndmoprass 4109 tz7.49c 4261 oaord 4317 fiint 4703 abfii2 4705 alephval3 5053 sup2 6219 elioo3g 6506 eliooord 6514 rexuz2 6572 elfz2 6600 elfzuzb 6604 fznn0 6647 expword2i 6802 abs2dif 7105 climcmplem 7340 isumcmpii 7419 mulc1cncf 7484 infxpidmlem7 7770 isbasis3g 7825 bl2in 8053 lmfval 8136 iscauf 8150 iscau5 8152 iscaunns 8155 nvex 8477 isnv 8478 sspval 8636 efifolem4 8997 axgroth3 9051 h2hcau 9124 dfadj2 10092 cnvadj 10096 adjeq 10139 eleigvec2 10162 irredi 10603 lediv2aALT 10656 symgoprab 10687 intn3an1d 10713 intn3an2d 10714 intn3an3d 10715 hmph 11030 dmhmph 11038 rnhmph 11039 hmeogrp 11044 efilcp 11083 efilcp2 11087 cnfilca 11088 limfillem1 11101 ishoma 11242 ishomb 11243 3anor 11389 compfipin0 11493 dfcon2 11501 fbasfip 11627 fbunfip 11631 filssufillem 11655 flimff 11707 fclsfnflim 11726 flimfnfcls 11727 fclusff 11735 phtpcer 12104 |