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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 9187 | . 2 ⊢ 4 = (3 + 1) | |
| 2 | 3re 9200 | . . 3 ⊢ 3 ∈ ℝ | |
| 3 | 1re 8161 | . . 3 ⊢ 1 ∈ ℝ | |
| 4 | 2, 3 | readdcli 8175 | . 2 ⊢ (3 + 1) ∈ ℝ |
| 5 | 1, 4 | eqeltri 2302 | 1 ⊢ 4 ∈ ℝ |
| Colors of variables: wff set class |
| Syntax hints: ∈ wcel 2200 (class class class)co 6010 ℝcr 8014 1c1 8016 + caddc 8018 3c3 9178 4c4 9179 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-5 1493 ax-gen 1495 ax-ie1 1539 ax-ie2 1540 ax-4 1556 ax-17 1572 ax-ial 1580 ax-ext 2211 ax-1re 8109 ax-addrcl 8112 |
| This theorem depends on definitions: df-bi 117 df-cleq 2222 df-clel 2225 df-2 9185 df-3 9186 df-4 9187 |
| This theorem is referenced by: 4cn 9204 5re 9205 4ne0 9224 4ap0 9225 5pos 9226 2lt4 9300 1lt4 9301 4lt5 9302 3lt5 9303 2lt5 9304 1lt5 9305 4lt6 9307 3lt6 9308 4lt7 9313 3lt7 9314 4lt8 9320 3lt8 9321 4lt9 9328 3lt9 9329 8th4div3 9346 div4p1lem1div2 9381 4lt10 9729 3lt10 9730 eluz4eluz2 9779 fz0to4untppr 10337 fzo0to42pr 10443 fldiv4p1lem1div2 10542 faclbnd2 10981 4bc2eq6 11013 resqrexlemover 11542 resqrexlemcalc1 11546 resqrexlemcalc2 11547 resqrexlemcalc3 11548 resqrexlemnm 11550 resqrexlemga 11555 sqrt2gt1lt2 11581 amgm2 11650 ef01bndlem 12288 sin01bnd 12289 cos01bnd 12290 cos2bnd 12292 flodddiv4 12468 4sqlem12 12946 tsetndxnstarvndx 13248 slotsdifplendx 13264 slotsdifdsndx 13279 slotsdifunifndx 13286 dveflem 15421 sin0pilem2 15477 sinhalfpilem 15486 sincosq1lem 15520 coseq0negpitopi 15531 tangtx 15533 sincos4thpi 15535 pigt3 15539 gausslemma2dlem0d 15752 gausslemma2dlem3 15763 gausslemma2dlem4 15764 |
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