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| Mirrors > Home > ILE Home > Th. List > 7re | GIF version | ||
| Description: The number 7 is real. (Contributed by NM, 27-May-1999.) |
| Ref | Expression |
|---|---|
| 7re | ⊢ 7 ∈ ℝ |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | df-7 9371 | . 2 ⊢ 7 = (6 + 1) | |
| 2 | 6re 9388 | . . 3 ⊢ 6 ∈ ℝ | |
| 3 | 1re 8326 | . . 3 ⊢ 1 ∈ ℝ | |
| 4 | 2, 3 | readdcli 8340 | . 2 ⊢ (6 + 1) ∈ ℝ |
| 5 | 1, 4 | eqeltri 2311 | 1 ⊢ 7 ∈ ℝ |
| Colors of variables: wff set class |
| This proof depends on syntax axioms: ∈ wcel 2209 (class class class)co 6085 ℝcr 8179 1c1 8181 + caddc 8183 6c6 9362 7c7 9363 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-5 1500 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-4 1563 ax-17 1579 ax-ial 1587 ax-ext 2220 ax-1re 8274 ax-addrcl 8277 |
| This proof depends on definitions: df-bi 117 df-cleq 2231 df-clel 2234 df-2 9366 df-3 9367 df-4 9368 df-5 9369 df-6 9370 df-7 9371 |
| This theorem is used by: 7cn 9391 8re 9392 8pos 9410 5lt7 9495 4lt7 9496 3lt7 9497 2lt7 9498 1lt7 9499 7lt8 9500 6lt8 9501 7lt9 9508 6lt9 9509 7lt10 9919 6lt10 9920 bposlem8 16279 lgsdir2lem1 16313 |
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