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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 8238.
In the Metamath Proof Explorer, this is not a complex number axiom but is proved from ax-1cn 8237 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 8152 | . 2 ⊢ 1 = 〈1R, 0R〉 | |
| 2 | 1sr 8083 | . . 3 ⊢ 1R ∈ R | |
| 3 | opelreal 8159 | . . 3 ⊢ (〈1R, 0R〉 ∈ ℝ ↔ 1R ∈ R) | |
| 4 | 2, 3 | mpbir 146 | . 2 ⊢ 〈1R, 0R〉 ∈ ℝ |
| 5 | 1, 4 | eqeltri 2307 | 1 ⊢ 1 ∈ ℝ |
| Colors of variables: wff set class |
| Syntax hints: ∈ wcel 2205 〈cop 3698 Rcnr 7629 0Rc0r 7630 1Rc1r 7631 ℝcr 8143 1c1 8145 |
| 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 619 ax-in2 620 ax-io 717 ax-5 1496 ax-7 1497 ax-gen 1498 ax-ie1 1542 ax-ie2 1543 ax-8 1553 ax-10 1554 ax-11 1555 ax-i12 1556 ax-bndl 1558 ax-4 1559 ax-17 1575 ax-i9 1579 ax-ial 1583 ax-i5r 1584 ax-13 2207 ax-14 2208 ax-ext 2216 ax-coll 4231 ax-sep 4234 ax-nul 4242 ax-pow 4293 ax-pr 4328 ax-un 4560 ax-setind 4665 ax-iinf 4716 |
| This theorem depends on definitions: df-bi 117 df-dc 843 df-3or 1006 df-3an 1007 df-tru 1401 df-fal 1404 df-nf 1510 df-sb 1812 df-eu 2085 df-mo 2086 df-clab 2221 df-cleq 2227 df-clel 2230 df-nfc 2375 df-ne 2415 df-ral 2527 df-rex 2528 df-reu 2529 df-rab 2531 df-v 2817 df-sbc 3046 df-csb 3142 df-dif 3216 df-un 3218 df-in 3220 df-ss 3227 df-nul 3513 df-pw 3677 df-sn 3701 df-pr 3702 df-op 3704 df-uni 3921 df-int 3956 df-iun 3999 df-br 4116 df-opab 4178 df-mpt 4179 df-tr 4215 df-eprel 4416 df-id 4420 df-po 4423 df-iso 4424 df-iord 4493 df-on 4495 df-suc 4498 df-iom 4719 df-xp 4761 df-rel 4762 df-cnv 4763 df-co 4764 df-dm 4765 df-rn 4766 df-res 4767 df-ima 4768 df-iota 5318 df-fun 5360 df-fn 5361 df-f 5362 df-f1 5363 df-fo 5364 df-f1o 5365 df-fv 5366 df-ov 6062 df-oprab 6063 df-mpo 6064 df-1st 6348 df-2nd 6349 df-recs 6550 df-irdg 6615 df-1o 6661 df-2o 6662 df-oadd 6665 df-omul 6666 df-er 6781 df-ec 6783 df-qs 6787 df-ni 7636 df-pli 7637 df-mi 7638 df-lti 7639 df-plpq 7676 df-mpq 7677 df-enq 7679 df-nqqs 7680 df-plqqs 7681 df-mqqs 7682 df-1nqqs 7683 df-rq 7684 df-ltnqqs 7685 df-enq0 7756 df-nq0 7757 df-0nq0 7758 df-plq0 7759 df-mq0 7760 df-inp 7798 df-i1p 7799 df-iplp 7800 df-enr 8058 df-nr 8059 df-0r 8063 df-1r 8064 df-1 8152 df-r 8154 |
| This theorem is referenced by: peano5nnnn 8224 |
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