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| Mirrors > Home > MPE Home > Th. List > 3t3e9 | Structured version Visualization version GIF version | ||
| Description: 3 times 3 equals 9. (Contributed by NM, 11-May-2004.) |
| Ref | Expression |
|---|---|
| 3t3e9 | ⊢ (3 · 3) = 9 |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | df-3 12310 | . . 3 ⊢ 3 = (2 + 1) | |
| 2 | 1 | oveq2i 7423 | . 2 ⊢ (3 · 3) = (3 · (2 + 1)) |
| 3 | 3cn 12328 | . . . . 5 ⊢ 3 ∈ ℂ | |
| 4 | 2cn 12322 | . . . . 5 ⊢ 2 ∈ ℂ | |
| 5 | ax-1cn 11164 | . . . . 5 ⊢ 1 ∈ ℂ | |
| 6 | 3, 4, 5 | adddii 11227 | . . . 4 ⊢ (3 · (2 + 1)) = ((3 · 2) + (3 · 1)) |
| 7 | 3t2e6 12412 | . . . . 5 ⊢ (3 · 2) = 6 | |
| 8 | 3t1e3 12411 | . . . . 5 ⊢ (3 · 1) = 3 | |
| 9 | 7, 8 | oveq12i 7424 | . . . 4 ⊢ ((3 · 2) + (3 · 1)) = (6 + 3) |
| 10 | 6, 9 | eqtri 2785 | . . 3 ⊢ (3 · (2 + 1)) = (6 + 3) |
| 11 | 6p3e9 12406 | . . 3 ⊢ (6 + 3) = 9 | |
| 12 | 10, 11 | eqtri 2785 | . 2 ⊢ (3 · (2 + 1)) = 9 |
| 13 | 2, 12 | eqtri 2785 | 1 ⊢ (3 · 3) = 9 |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: = wceq 1569 (class class class)co 7412 1c1 11107 + caddc 11109 · cmul 11111 2c2 12301 3c3 12302 6c6 12305 9c9 12308 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1824 ax-4 1838 ax-5 1939 ax-6 1996 ax-7 2037 ax-8 2144 ax-9 2152 ax-ext 2734 ax-resscn 11163 ax-1cn 11164 ax-icn 11165 ax-addcl 11166 ax-mulcl 11168 ax-mulcom 11170 ax-addass 11171 ax-mulass 11172 ax-distr 11173 ax-1rid 11176 ax-cnre 11179 |
| This proof depends on definitions: df-bi 210 df-an 401 df-or 861 df-3an 1104 df-tru 1572 df-fal 1582 df-ex 1809 df-sb 2096 df-clab 2741 df-cleq 2754 df-clel 2837 df-rex 3089 df-rab 3416 df-v 3456 df-dif 3907 df-un 3909 df-ss 3921 df-nul 4286 df-if 4487 df-sn 4589 df-pr 4591 df-op 4595 df-uni 4872 df-br 5109 df-iota 6492 df-fv 6544 df-ov 7415 df-2 12309 df-3 12310 df-4 12311 df-5 12312 df-6 12313 df-7 12314 df-8 12315 df-9 12316 |
| This theorem is used by: sq3 14241 3dvds 16395 3dvdsdec 16396 3dvds2dec 16397 9nprm 17178 11prm 17181 43prm 17188 83prm 17189 317prm 17192 1259lem2 17198 1259lem4 17200 1259prm 17202 2503lem2 17204 mcubic 27023 log2tlbnd 27121 log2ublem3 27124 log2ub 27125 bposlem9 27467 lgsdir2lem5 27504 ex-lcm 30820 hgt750lem 35047 hgt750lem2 35048 3lexlogpow2ineq2 42854 3lexlogpow5ineq5 42855 3cubeslem3l 43445 3cubeslem3r 43446 inductionexd 44909 fmtno5lem3 48335 fmtno4prmfac193 48353 fmtno4nprmfac193 48354 127prm 48379 2exp340mod341 48526 9fppr8 48530 |
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