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| Mirrors > Home > MPE Home > Th. List > df-4 | Structured version Visualization version GIF version | ||
| Description: Define the number 4. (Contributed by NM, 27-May-1999.) |
| Ref | Expression |
|---|---|
| df-4 | ⊢ 4 = (3 + 1) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | c4 12307 | . 2 class 4 | |
| 2 | c3 12306 | . . 3 class 3 | |
| 3 | c1 11111 | . . 3 class 1 | |
| 4 | caddc 11113 | . . 3 class + | |
| 5 | 2, 3, 4 | co 7416 | . 2 class (3 + 1) |
| 6 | 1, 5 | wceq 1570 | 1 wff 4 = (3 + 1) |
| Colors of variables: wff setvar class |
| This definition is used by: 4nn 12334 4re 12335 4cn 12336 4m1e3 12379 2p2e4 12385 3p1e4 12395 3p2e5 12401 4p4e8 12405 5p4e9 12408 3lt4 12427 6p4e10 12798 7p4e11 12802 7p7e14 12805 8p4e12 12808 8p6e14 12810 9p4e13 12815 9p5e14 12816 4t4e16 12825 5t4e20 12828 6t4e24 12832 7t4e28 12837 8t4e32 12843 9t4e36 12850 fz0to4untppr 13669 4bc2eq6 14376 bpoly3 16122 bpoly4 16123 fsumcube 16124 ef4p 16179 ef01bndlem 16250 ge2nprmge4 16770 lt6abl 19975 cphipval 25417 sincosq4sgn 26681 binom4 27030 quart1lem 27035 log2cnv 27124 ppiublem2 27382 ppiub 27383 chtub 27391 bclbnd 27459 bposlem8 27470 lgsdir2lem3 27506 3wlkdlem1 30525 ipval2 31074 problem3 36171 aks4d1p1p7 42873 rmydioph 43773 rmxdioph 43775 expdiophlem2 43781 lt4addmuld 46057 stoweidlem13 46759 sin5tlem2 47643 m1modnep2mod 48127 4even 48506 sbgoldbo 48584 ackval40 49505 ackval41a 49506 ackval42 49508 |
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