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| Mirrors > Home > ILE Home > Th. List > 9p1e10 | GIF version | ||
| Description: 9 + 1 = 10. (Contributed by Mario Carneiro, 18-Apr-2015.) (Revised by Stanislas Polu, 7-Apr-2020.) (Revised by AV, 1-Aug-2021.) |
| Ref | Expression |
|---|---|
| 9p1e10 | ⊢ (9 + 1) = ;10 |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | df-dec 9761 | . 2 ⊢ ;10 = (((9 + 1) · 1) + 0) | |
| 2 | 9nn 9456 | . . . . . 6 ⊢ 9 ∈ ℕ | |
| 3 | 1nn 9298 | . . . . . 6 ⊢ 1 ∈ ℕ | |
| 4 | nnaddcl 9307 | . . . . . 6 ⊢ ((9 ∈ ℕ ∧ 1 ∈ ℕ) → (9 + 1) ∈ ℕ) | |
| 5 | 2, 3, 4 | mp2an 430 | . . . . 5 ⊢ (9 + 1) ∈ ℕ |
| 6 | 5 | nncni 9297 | . . . 4 ⊢ (9 + 1) ∈ ℂ |
| 7 | 6 | mulridi 8322 | . . 3 ⊢ ((9 + 1) · 1) = (9 + 1) |
| 8 | 7 | oveq1i 6089 | . 2 ⊢ (((9 + 1) · 1) + 0) = ((9 + 1) + 0) |
| 9 | 6 | addridi 8462 | . 2 ⊢ ((9 + 1) + 0) = (9 + 1) |
| 10 | 1, 8, 9 | 3eqtrri 2264 | 1 ⊢ (9 + 1) = ;10 |
| Colors of variables: wff set class |
| This proof depends on syntax axioms: = wceq 1402 ∈ wcel 2209 (class class class)co 6079 0cc0 8173 1c1 8174 + caddc 8176 · cmul 8178 ℕcn 9287 9c9 9345 ;cdc 9760 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-io 721 ax-5 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-10 1558 ax-11 1559 ax-i12 1560 ax-bndl 1562 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-i5r 1588 ax-ext 2220 ax-sep 4247 ax-cnex 8264 ax-resscn 8265 ax-1cn 8266 ax-1re 8267 ax-icn 8268 ax-addcl 8269 ax-addrcl 8270 ax-mulcl 8271 ax-mulcom 8274 ax-addass 8275 ax-mulass 8276 ax-distr 8277 ax-1rid 8280 ax-0id 8281 ax-cnre 8284 |
| This proof depends on definitions: df-bi 117 df-3an 1011 df-tru 1405 df-nf 1514 df-sb 1816 df-clab 2225 df-cleq 2231 df-clel 2234 df-nfc 2381 df-ral 2533 df-rex 2534 df-rab 2537 df-v 2823 df-un 3224 df-in 3226 df-ss 3233 df-sn 3714 df-pr 3715 df-op 3717 df-uni 3934 df-int 3969 df-br 4129 df-iota 5335 df-fv 5383 df-ov 6082 df-inn 9288 df-2 9346 df-3 9347 df-4 9348 df-5 9349 df-6 9350 df-7 9351 df-8 9352 df-9 9353 df-dec 9761 |
| This theorem is used by: dfdec10 9763 10nn 9775 le9lt10 9786 decsucc 9800 5p5e10 9830 6p4e10 9831 7p3e10 9834 8p2e10 9839 9p2e11 9846 10m1e9 9855 9lt10 9890 sq10e99m1 11134 3dvds 12614 3dvdsdec 12615 3dvds2dec 12616 |
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