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| Mirrors > Home > ILE Home > Th. List > ax1re | GIF version | ||
| Description: 1 is a real number.
Axiom for real and complex numbers, derived from set
theory. This construction-dependent theorem should not be referenced
directly; instead, use ax-1re 8081.
In the Metamath Proof Explorer, this is not a complex number axiom but is proved from ax-1cn 8080 and the other axioms. It is not known whether we can do so here, but the Metamath Proof Explorer proof (accessed 13-Jan-2020) uses excluded middle. (Contributed by Jim Kingdon, 13-Jan-2020.) (New usage is discouraged.) |
| Ref | Expression |
|---|---|
| ax1re | ⊢ 1 ∈ ℝ |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | df-1 7995 | . 2 ⊢ 1 = 〈1R, 0R〉 | |
| 2 | 1sr 7926 | . . 3 ⊢ 1R ∈ R | |
| 3 | opelreal 8002 | . . 3 ⊢ (〈1R, 0R〉 ∈ ℝ ↔ 1R ∈ R) | |
| 4 | 2, 3 | mpbir 146 | . 2 ⊢ 〈1R, 0R〉 ∈ ℝ |
| 5 | 1, 4 | eqeltri 2302 | 1 ⊢ 1 ∈ ℝ |
| Colors of variables: wff set class |
| Syntax hints: ∈ wcel 2200 〈cop 3669 Rcnr 7472 0Rc0r 7473 1Rc1r 7474 ℝcr 7986 1c1 7988 |
| 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-in1 617 ax-in2 618 ax-io 714 ax-5 1493 ax-7 1494 ax-gen 1495 ax-ie1 1539 ax-ie2 1540 ax-8 1550 ax-10 1551 ax-11 1552 ax-i12 1553 ax-bndl 1555 ax-4 1556 ax-17 1572 ax-i9 1576 ax-ial 1580 ax-i5r 1581 ax-13 2202 ax-14 2203 ax-ext 2211 ax-coll 4198 ax-sep 4201 ax-nul 4209 ax-pow 4257 ax-pr 4292 ax-un 4521 ax-setind 4626 ax-iinf 4677 |
| This theorem depends on definitions: df-bi 117 df-dc 840 df-3or 1003 df-3an 1004 df-tru 1398 df-fal 1401 df-nf 1507 df-sb 1809 df-eu 2080 df-mo 2081 df-clab 2216 df-cleq 2222 df-clel 2225 df-nfc 2361 df-ne 2401 df-ral 2513 df-rex 2514 df-reu 2515 df-rab 2517 df-v 2801 df-sbc 3029 df-csb 3125 df-dif 3199 df-un 3201 df-in 3203 df-ss 3210 df-nul 3492 df-pw 3651 df-sn 3672 df-pr 3673 df-op 3675 df-uni 3888 df-int 3923 df-iun 3966 df-br 4083 df-opab 4145 df-mpt 4146 df-tr 4182 df-eprel 4377 df-id 4381 df-po 4384 df-iso 4385 df-iord 4454 df-on 4456 df-suc 4459 df-iom 4680 df-xp 4722 df-rel 4723 df-cnv 4724 df-co 4725 df-dm 4726 df-rn 4727 df-res 4728 df-ima 4729 df-iota 5274 df-fun 5316 df-fn 5317 df-f 5318 df-f1 5319 df-fo 5320 df-f1o 5321 df-fv 5322 df-ov 5997 df-oprab 5998 df-mpo 5999 df-1st 6276 df-2nd 6277 df-recs 6441 df-irdg 6506 df-1o 6552 df-2o 6553 df-oadd 6556 df-omul 6557 df-er 6670 df-ec 6672 df-qs 6676 df-ni 7479 df-pli 7480 df-mi 7481 df-lti 7482 df-plpq 7519 df-mpq 7520 df-enq 7522 df-nqqs 7523 df-plqqs 7524 df-mqqs 7525 df-1nqqs 7526 df-rq 7527 df-ltnqqs 7528 df-enq0 7599 df-nq0 7600 df-0nq0 7601 df-plq0 7602 df-mq0 7603 df-inp 7641 df-i1p 7642 df-iplp 7643 df-enr 7901 df-nr 7902 df-0r 7906 df-1r 7907 df-1 7995 df-r 7997 |
| This theorem is referenced by: peano5nnnn 8067 |
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