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| Mirrors > Home > ILE Home > Th. List > df-3 | GIF version | ||
| Description: Define the number 3. (Contributed by NM, 27-May-1999.) |
| Ref | Expression |
|---|---|
| df-3 | ⊢ 3 = (2 + 1) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | c3 9070 | . 2 class 3 | |
| 2 | c2 9069 | . . 3 class 2 | |
| 3 | c1 7908 | . . 3 class 1 | |
| 4 | caddc 7910 | . . 3 class + | |
| 5 | 2, 3, 4 | co 5934 | . 2 class (2 + 1) |
| 6 | 1, 5 | wceq 1372 | 1 wff 3 = (2 + 1) |
| Colors of variables: wff set class |
| This definition is referenced by: 3re 9092 3pos 9112 3m1e2 9138 2p2e4 9145 2p1e3 9152 3p3e6 9161 4p3e7 9163 5p3e8 9166 6p3e9 9169 3t3e9 9176 3nn 9181 2lt3 9189 7p3e10 9560 7p6e13 9563 8p3e11 9566 8p5e13 9568 9p3e12 9573 9p4e13 9574 4t3e12 9583 5t3e15 9586 6t3e18 9590 7t3e21 9595 8t3e24 9601 9t3e27 9608 nn01to3 9720 fztpval 10187 fz0to3un2pr 10227 fz0to4untppr 10228 fzo0to42pr 10330 cu2 10764 i3 10767 binom3 10783 fac3 10858 ege2le3 11901 ef4p 11924 cos1bnd 11989 3prm 12369 oddprmge3 12376 dveflem 15116 sincosq3sgn 15218 sincosq4sgn 15219 tangtx 15228 sincos6thpi 15232 binom4 15369 lgsdir2lem3 15425 |
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