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Mirrors > Home > ILE Home > Th. List > nn0ssre | GIF version |
Description: Nonnegative integers are a subset of the reals. (Contributed by Raph Levien, 10-Dec-2002.) |
Ref | Expression |
---|---|
nn0ssre | ⊢ ℕ0 ⊆ ℝ |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-n0 8182 | . 2 ⊢ ℕ0 = (ℕ ∪ {0}) | |
2 | nnssre 7918 | . . 3 ⊢ ℕ ⊆ ℝ | |
3 | 0re 7027 | . . . 4 ⊢ 0 ∈ ℝ | |
4 | snssi 3508 | . . . 4 ⊢ (0 ∈ ℝ → {0} ⊆ ℝ) | |
5 | 3, 4 | ax-mp 7 | . . 3 ⊢ {0} ⊆ ℝ |
6 | 2, 5 | unssi 3118 | . 2 ⊢ (ℕ ∪ {0}) ⊆ ℝ |
7 | 1, 6 | eqsstri 2975 | 1 ⊢ ℕ0 ⊆ ℝ |
Colors of variables: wff set class |
Syntax hints: ∈ wcel 1393 ∪ cun 2915 ⊆ wss 2917 {csn 3375 ℝcr 6888 0cc0 6889 ℕcn 7914 ℕ0cn0 8181 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 99 ax-ia2 100 ax-ia3 101 ax-io 630 ax-5 1336 ax-7 1337 ax-gen 1338 ax-ie1 1382 ax-ie2 1383 ax-8 1395 ax-10 1396 ax-11 1397 ax-i12 1398 ax-bndl 1399 ax-4 1400 ax-17 1419 ax-i9 1423 ax-ial 1427 ax-i5r 1428 ax-ext 2022 ax-sep 3875 ax-cnex 6975 ax-resscn 6976 ax-1re 6978 ax-addrcl 6981 ax-rnegex 6993 |
This theorem depends on definitions: df-bi 110 df-tru 1246 df-nf 1350 df-sb 1646 df-clab 2027 df-cleq 2033 df-clel 2036 df-nfc 2167 df-ral 2311 df-rex 2312 df-v 2559 df-un 2922 df-in 2924 df-ss 2931 df-sn 3381 df-int 3616 df-inn 7915 df-n0 8182 |
This theorem is referenced by: nn0sscn 8186 nn0re 8190 nn0rei 8192 nn0red 8236 |
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