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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 9368 | . 2 ⊢ 4 = (3 + 1) | |
| 2 | 3re 9381 | . . 3 ⊢ 3 ∈ ℝ | |
| 3 | 1re 8326 | . . 3 ⊢ 1 ∈ ℝ | |
| 4 | 2, 3 | readdcli 8340 | . 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 6085 ℝcr 8179 1c1 8181 + caddc 8183 3c3 9359 4c4 9360 |
| 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 |
| This theorem is used by: 4cn 9385 5re 9386 4ne0 9405 4ap0 9406 5pos 9407 2lt4 9483 1lt4 9484 4lt5 9485 3lt5 9486 2lt5 9487 1lt5 9488 4lt6 9490 3lt6 9491 4lt7 9496 3lt7 9497 4lt8 9503 3lt8 9504 4lt9 9511 3lt9 9512 8th4div3 9529 div4p1lem1div2 9564 4lt10 9922 3lt10 9923 uzuzle24 9973 uzuzle34 9974 eluz4eluz2 9978 fz0to4untppr 10542 fzo0to42pr 10649 fldiv4p1lem1div2 10755 faclbnd2 11196 4bc2eq6 11229 resqrexlemover 11792 resqrexlemcalc1 11796 resqrexlemcalc2 11797 resqrexlemcalc3 11798 resqrexlemnm 11800 resqrexlemga 11805 sqrt2gt1lt2 11831 amgm2 11901 ef01bndlem 12542 sin01bnd 12543 cos01bnd 12544 cos2bnd 12546 flodddiv4 12722 4sqlem12 13204 tsetndxnstarvndx 13601 slotsdifplendx 13617 slotsdifdsndx 13632 slotsdifunifndx 13639 dveflem 15918 sin0pilem2 15975 sinhalfpilem 15984 sincosq1lem 16018 coseq0negpitopi 16029 tangtx 16031 sincos4thpi 16033 pigt3 16037 chtublem 16256 bposlem2 16273 bposlem6 16277 bposlem7 16278 bposlem8 16279 bposlem9 16280 gausslemma2dlem0d 16337 gausslemma2dlem3 16348 gausslemma2dlem4 16349 |
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