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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 9182 | . 2 ⊢ 4 = (3 + 1) | |
| 2 | 3re 9195 | . . 3 ⊢ 3 ∈ ℝ | |
| 3 | 1re 8156 | . . 3 ⊢ 1 ∈ ℝ | |
| 4 | 2, 3 | readdcli 8170 | . 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 6007 ℝcr 8009 1c1 8011 + caddc 8013 3c3 9173 4c4 9174 |
| 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 8104 ax-addrcl 8107 |
| This theorem depends on definitions: df-bi 117 df-cleq 2222 df-clel 2225 df-2 9180 df-3 9181 df-4 9182 |
| This theorem is referenced by: 4cn 9199 5re 9200 4ne0 9219 4ap0 9220 5pos 9221 2lt4 9295 1lt4 9296 4lt5 9297 3lt5 9298 2lt5 9299 1lt5 9300 4lt6 9302 3lt6 9303 4lt7 9308 3lt7 9309 4lt8 9315 3lt8 9316 4lt9 9323 3lt9 9324 8th4div3 9341 div4p1lem1div2 9376 4lt10 9724 3lt10 9725 eluz4eluz2 9774 fz0to4untppr 10332 fzo0to42pr 10438 fldiv4p1lem1div2 10537 faclbnd2 10976 4bc2eq6 11008 resqrexlemover 11536 resqrexlemcalc1 11540 resqrexlemcalc2 11541 resqrexlemcalc3 11542 resqrexlemnm 11544 resqrexlemga 11549 sqrt2gt1lt2 11575 amgm2 11644 ef01bndlem 12282 sin01bnd 12283 cos01bnd 12284 cos2bnd 12286 flodddiv4 12462 4sqlem12 12940 tsetndxnstarvndx 13242 slotsdifplendx 13258 slotsdifdsndx 13273 slotsdifunifndx 13280 dveflem 15415 sin0pilem2 15471 sinhalfpilem 15480 sincosq1lem 15514 coseq0negpitopi 15525 tangtx 15527 sincos4thpi 15529 pigt3 15533 gausslemma2dlem0d 15746 gausslemma2dlem3 15757 gausslemma2dlem4 15758 |
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