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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 9178 | . 2 class 3 | |
| 2 | c2 9177 | . . 3 class 2 | |
| 3 | c1 8016 | . . 3 class 1 | |
| 4 | caddc 8018 | . . 3 class + | |
| 5 | 2, 3, 4 | co 6010 | . 2 class (2 + 1) |
| 6 | 1, 5 | wceq 1395 | 1 wff 3 = (2 + 1) |
| Colors of variables: wff set class |
| This definition is referenced by: 3re 9200 3pos 9220 3m1e2 9246 2p2e4 9253 2p1e3 9260 3p3e6 9269 4p3e7 9271 5p3e8 9274 6p3e9 9277 3t3e9 9284 3nn 9289 2lt3 9297 7p3e10 9668 7p6e13 9671 8p3e11 9674 8p5e13 9676 9p3e12 9681 9p4e13 9682 4t3e12 9691 5t3e15 9694 6t3e18 9698 7t3e21 9703 8t3e24 9709 9t3e27 9716 nn01to3 9829 fztpval 10296 fz0to3un2pr 10336 fz0to4untppr 10337 fzo0to42pr 10443 cu2 10877 i3 10880 binom3 10896 fac3 10971 ege2le3 12203 ef4p 12226 cos1bnd 12291 3prm 12671 oddprmge3 12678 dveflem 15421 sincosq3sgn 15523 sincosq4sgn 15524 tangtx 15533 sincos6thpi 15537 binom4 15674 lgsdir2lem3 15730 |
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