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| Mirrors > Home > ILE Home > Th. List > 4re | GIF version | ||
| Description: The number 4 is real. (Contributed by NM, 27-May-1999.) |
| Ref | Expression |
|---|---|
| 4re | ⊢ 4 ∈ ℝ |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | df-4 9374 | . 2 ⊢ 4 = (3 + 1) | |
| 2 | 3re 9387 | . . 3 ⊢ 3 ∈ ℝ | |
| 3 | 1re 8331 | . . 3 ⊢ 1 ∈ ℝ | |
| 4 | 2, 3 | readdcli 8345 | . 2 ⊢ (3 + 1) ∈ ℝ |
| 5 | 1, 4 | eqeltri 2311 | 1 ⊢ 4 ∈ 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 3c3 9365 4c4 9366 |
| 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 |
| This theorem is used by: 4cn 9391 5re 9392 4ne0 9411 4ap0 9412 5pos 9413 2lt4 9489 1lt4 9490 4lt5 9491 3lt5 9492 2lt5 9493 1lt5 9494 4lt6 9496 3lt6 9497 4lt7 9502 3lt7 9503 4lt8 9509 3lt8 9510 4lt9 9517 3lt9 9518 8th4div3 9535 div4p1lem1div2 9570 4lt10 9927 3lt10 9928 uzuzle24 9978 uzuzle34 9979 eluz4eluz2 9983 fz0to4untppr 10547 fzo0to42pr 10654 fldiv4p1lem1div2 10760 faclbnd2 11201 4bc2eq6 11234 resqrexlemover 11797 resqrexlemcalc1 11801 resqrexlemcalc2 11802 resqrexlemcalc3 11803 resqrexlemnm 11805 resqrexlemga 11810 sqrt2gt1lt2 11836 amgm2 11906 ef01bndlem 12547 sin01bnd 12548 cos01bnd 12549 cos2bnd 12551 flodddiv4 12727 4sqlem12 13209 tsetndxnstarvndx 13606 slotsdifplendx 13622 slotsdifdsndx 13637 slotsdifunifndx 13644 dveflem 15969 sin0pilem2 16026 sinhalfpilem 16035 sincosq1lem 16069 coseq0negpitopi 16080 tangtx 16082 sincos4thpi 16084 pigt3 16088 chtublem 16312 bposlem2 16329 bposlem6 16333 bposlem7 16334 bposlem8 16335 bposlem9 16336 gausslemma2dlem0d 16393 gausslemma2dlem3 16404 gausslemma2dlem4 16405 |
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