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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 9002 | . 2 ⊢ ℕ0 = (ℕ ∪ {0}) | |
2 | nnssre 8748 | . . 3 ⊢ ℕ ⊆ ℝ | |
3 | 0re 7790 | . . . 4 ⊢ 0 ∈ ℝ | |
4 | snssi 3672 | . . . 4 ⊢ (0 ∈ ℝ → {0} ⊆ ℝ) | |
5 | 3, 4 | ax-mp 5 | . . 3 ⊢ {0} ⊆ ℝ |
6 | 2, 5 | unssi 3256 | . 2 ⊢ (ℕ ∪ {0}) ⊆ ℝ |
7 | 1, 6 | eqsstri 3134 | 1 ⊢ ℕ0 ⊆ ℝ |
Colors of variables: wff set class |
Syntax hints: ∈ wcel 1481 ∪ cun 3074 ⊆ wss 3076 {csn 3532 ℝcr 7643 0cc0 7644 ℕcn 8744 ℕ0cn0 9001 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-io 699 ax-5 1424 ax-7 1425 ax-gen 1426 ax-ie1 1470 ax-ie2 1471 ax-8 1483 ax-10 1484 ax-11 1485 ax-i12 1486 ax-bndl 1487 ax-4 1488 ax-17 1507 ax-i9 1511 ax-ial 1515 ax-i5r 1516 ax-ext 2122 ax-sep 4054 ax-cnex 7735 ax-resscn 7736 ax-1re 7738 ax-addrcl 7741 ax-rnegex 7753 |
This theorem depends on definitions: df-bi 116 df-tru 1335 df-nf 1438 df-sb 1737 df-clab 2127 df-cleq 2133 df-clel 2136 df-nfc 2271 df-ral 2422 df-rex 2423 df-v 2691 df-un 3080 df-in 3082 df-ss 3089 df-sn 3538 df-int 3780 df-inn 8745 df-n0 9002 |
This theorem is referenced by: nn0sscn 9006 nn0re 9010 nn0rei 9012 nn0red 9055 |
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