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| Mirrors > Home > ILE Home > Th. List > 8re | GIF version | ||
| Description: The number 8 is real. (Contributed by NM, 27-May-1999.) |
| Ref | Expression |
|---|---|
| 8re | ⊢ 8 ∈ ℝ |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | df-8 9378 | . 2 ⊢ 8 = (7 + 1) | |
| 2 | 7re 9396 | . . 3 ⊢ 7 ∈ ℝ | |
| 3 | 1re 8331 | . . 3 ⊢ 1 ∈ ℝ | |
| 4 | 2, 3 | readdcli 8345 | . 2 ⊢ (7 + 1) ∈ ℝ |
| 5 | 1, 4 | eqeltri 2311 | 1 ⊢ 8 ∈ ℝ |
| Colors of variables: wff set class |
| This proof depends on syntax axioms: ∈ wcel 2209 (class class class)co 6088 ℝcr 8184 1c1 8186 + caddc 8188 7c7 9369 8c8 9370 |
| 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 8279 ax-addrcl 8282 |
| This proof depends on definitions: df-bi 117 df-cleq 2231 df-clel 2234 df-2 9372 df-3 9373 df-4 9374 df-5 9375 df-6 9376 df-7 9377 df-8 9378 |
| This theorem is used by: 8cn 9399 9re 9400 9pos 9417 6lt8 9507 5lt8 9508 4lt8 9509 3lt8 9510 2lt8 9511 1lt8 9512 8lt9 9513 7lt9 9514 8th4div3 9535 8lt10 9923 7lt10 9924 ef01bndlem 12547 cos2bnd 12551 slotstnscsi 13607 slotsdnscsi 13635 chtqub 16313 bposlem8 16335 bposlem9 16336 2lgsoddprmlem1 16446 2lgsoddprmlem2 16447 2lgsoddprmlem3a 16448 2lgsoddprmlem3b 16449 2lgsoddprmlem3c 16450 2lgsoddprmlem3d 16451 |
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