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| Mirrors > Home > ILE Home > Th. List > 9nn0 | GIF version | ||
| Description: 9 is a nonnegative integer. (Contributed by Mario Carneiro, 19-Apr-2015.) |
| Ref | Expression |
|---|---|
| 9nn0 | ⊢ 9 ∈ ℕ0 |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 9nn 9473 | . 2 ⊢ 9 ∈ ℕ | |
| 2 | 1 | nnnn0i 9571 | 1 ⊢ 9 ∈ ℕ0 |
| Colors of variables: wff set class |
| This proof depends on syntax axioms: ∈ wcel 2209 9c9 9362 ℕ0cn0 9563 |
| 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 4249 ax-cnex 8270 ax-resscn 8271 ax-1re 8273 ax-addrcl 8276 |
| 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-v 2823 df-un 3224 df-in 3226 df-ss 3233 df-sn 3715 df-pr 3716 df-op 3718 df-uni 3936 df-int 3971 df-br 4131 df-iota 5337 df-fv 5385 df-ov 6088 df-inn 9305 df-2 9363 df-3 9364 df-4 9365 df-5 9366 df-6 9367 df-7 9368 df-8 9369 df-9 9370 df-n0 9564 |
| This theorem is used by: deccl 9791 le9lt10 9803 decsucc 9817 9p2e11 9863 9p3e12 9864 9p4e13 9865 9p5e14 9866 9p6e15 9867 9p7e16 9868 9p8e17 9869 9p9e18 9870 9t3e27 9899 9t4e36 9900 9t5e45 9901 9t6e54 9902 9t7e63 9903 9t8e72 9904 9t9e81 9905 sq10e99m1 11151 3dvds2dec 12633 2exp8 13214 dsndxntsetndx 13578 unifndxntsetndx 13585 setsmsdsg 15581 log2ublem3 16085 log2ublog2 16086 |
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