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| Mirrors > Home > ILE Home > Th. List > ax1rid | GIF version | ||
| Description: 1 is an identity element for real multiplication. Axiom for real and complex numbers, derived from set theory. This construction-dependent theorem should not be referenced directly; instead, use ax-1rid 8074. (Contributed by Scott Fenton, 3-Jan-2013.) (New usage is discouraged.) |
| Ref | Expression |
|---|---|
| ax1rid | ⊢ (𝐴 ∈ ℝ → (𝐴 · 1) = 𝐴) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | df-r 7977 | . 2 ⊢ ℝ = (R × {0R}) | |
| 2 | oveq1 5981 | . . 3 ⊢ (〈𝑥, 𝑦〉 = 𝐴 → (〈𝑥, 𝑦〉 · 1) = (𝐴 · 1)) | |
| 3 | id 19 | . . 3 ⊢ (〈𝑥, 𝑦〉 = 𝐴 → 〈𝑥, 𝑦〉 = 𝐴) | |
| 4 | 2, 3 | eqeq12d 2224 | . 2 ⊢ (〈𝑥, 𝑦〉 = 𝐴 → ((〈𝑥, 𝑦〉 · 1) = 〈𝑥, 𝑦〉 ↔ (𝐴 · 1) = 𝐴)) |
| 5 | elsni 3664 | . . 3 ⊢ (𝑦 ∈ {0R} → 𝑦 = 0R) | |
| 6 | df-1 7975 | . . . . . . 7 ⊢ 1 = 〈1R, 0R〉 | |
| 7 | 6 | oveq2i 5985 | . . . . . 6 ⊢ (〈𝑥, 0R〉 · 1) = (〈𝑥, 0R〉 · 〈1R, 0R〉) |
| 8 | 1sr 7906 | . . . . . . . 8 ⊢ 1R ∈ R | |
| 9 | mulresr 7993 | . . . . . . . 8 ⊢ ((𝑥 ∈ R ∧ 1R ∈ R) → (〈𝑥, 0R〉 · 〈1R, 0R〉) = 〈(𝑥 ·R 1R), 0R〉) | |
| 10 | 8, 9 | mpan2 425 | . . . . . . 7 ⊢ (𝑥 ∈ R → (〈𝑥, 0R〉 · 〈1R, 0R〉) = 〈(𝑥 ·R 1R), 0R〉) |
| 11 | 1idsr 7923 | . . . . . . . 8 ⊢ (𝑥 ∈ R → (𝑥 ·R 1R) = 𝑥) | |
| 12 | 11 | opeq1d 3842 | . . . . . . 7 ⊢ (𝑥 ∈ R → 〈(𝑥 ·R 1R), 0R〉 = 〈𝑥, 0R〉) |
| 13 | 10, 12 | eqtrd 2242 | . . . . . 6 ⊢ (𝑥 ∈ R → (〈𝑥, 0R〉 · 〈1R, 0R〉) = 〈𝑥, 0R〉) |
| 14 | 7, 13 | eqtrid 2254 | . . . . 5 ⊢ (𝑥 ∈ R → (〈𝑥, 0R〉 · 1) = 〈𝑥, 0R〉) |
| 15 | opeq2 3837 | . . . . . . 7 ⊢ (𝑦 = 0R → 〈𝑥, 𝑦〉 = 〈𝑥, 0R〉) | |
| 16 | 15 | oveq1d 5989 | . . . . . 6 ⊢ (𝑦 = 0R → (〈𝑥, 𝑦〉 · 1) = (〈𝑥, 0R〉 · 1)) |
| 17 | 16, 15 | eqeq12d 2224 | . . . . 5 ⊢ (𝑦 = 0R → ((〈𝑥, 𝑦〉 · 1) = 〈𝑥, 𝑦〉 ↔ (〈𝑥, 0R〉 · 1) = 〈𝑥, 0R〉)) |
| 18 | 14, 17 | imbitrrid 156 | . . . 4 ⊢ (𝑦 = 0R → (𝑥 ∈ R → (〈𝑥, 𝑦〉 · 1) = 〈𝑥, 𝑦〉)) |
| 19 | 18 | impcom 125 | . . 3 ⊢ ((𝑥 ∈ R ∧ 𝑦 = 0R) → (〈𝑥, 𝑦〉 · 1) = 〈𝑥, 𝑦〉) |
| 20 | 5, 19 | sylan2 286 | . 2 ⊢ ((𝑥 ∈ R ∧ 𝑦 ∈ {0R}) → (〈𝑥, 𝑦〉 · 1) = 〈𝑥, 𝑦〉) |
| 21 | 1, 4, 20 | optocl 4772 | 1 ⊢ (𝐴 ∈ ℝ → (𝐴 · 1) = 𝐴) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 = wceq 1375 ∈ wcel 2180 {csn 3646 〈cop 3649 (class class class)co 5974 Rcnr 7452 0Rc0r 7453 1Rc1r 7454 ·R cmr 7457 ℝcr 7966 1c1 7968 · cmul 7972 |
| 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 713 ax-5 1473 ax-7 1474 ax-gen 1475 ax-ie1 1519 ax-ie2 1520 ax-8 1530 ax-10 1531 ax-11 1532 ax-i12 1533 ax-bndl 1535 ax-4 1536 ax-17 1552 ax-i9 1556 ax-ial 1560 ax-i5r 1561 ax-13 2182 ax-14 2183 ax-ext 2191 ax-coll 4178 ax-sep 4181 ax-nul 4189 ax-pow 4237 ax-pr 4272 ax-un 4501 ax-setind 4606 ax-iinf 4657 |
| This theorem depends on definitions: df-bi 117 df-dc 839 df-3or 984 df-3an 985 df-tru 1378 df-fal 1381 df-nf 1487 df-sb 1789 df-eu 2060 df-mo 2061 df-clab 2196 df-cleq 2202 df-clel 2205 df-nfc 2341 df-ne 2381 df-ral 2493 df-rex 2494 df-reu 2495 df-rab 2497 df-v 2781 df-sbc 3009 df-csb 3105 df-dif 3179 df-un 3181 df-in 3183 df-ss 3190 df-nul 3472 df-pw 3631 df-sn 3652 df-pr 3653 df-op 3655 df-uni 3868 df-int 3903 df-iun 3946 df-br 4063 df-opab 4125 df-mpt 4126 df-tr 4162 df-eprel 4357 df-id 4361 df-po 4364 df-iso 4365 df-iord 4434 df-on 4436 df-suc 4439 df-iom 4660 df-xp 4702 df-rel 4703 df-cnv 4704 df-co 4705 df-dm 4706 df-rn 4707 df-res 4708 df-ima 4709 df-iota 5254 df-fun 5296 df-fn 5297 df-f 5298 df-f1 5299 df-fo 5300 df-f1o 5301 df-fv 5302 df-ov 5977 df-oprab 5978 df-mpo 5979 df-1st 6256 df-2nd 6257 df-recs 6421 df-irdg 6486 df-1o 6532 df-2o 6533 df-oadd 6536 df-omul 6537 df-er 6650 df-ec 6652 df-qs 6656 df-ni 7459 df-pli 7460 df-mi 7461 df-lti 7462 df-plpq 7499 df-mpq 7500 df-enq 7502 df-nqqs 7503 df-plqqs 7504 df-mqqs 7505 df-1nqqs 7506 df-rq 7507 df-ltnqqs 7508 df-enq0 7579 df-nq0 7580 df-0nq0 7581 df-plq0 7582 df-mq0 7583 df-inp 7621 df-i1p 7622 df-iplp 7623 df-imp 7624 df-enr 7881 df-nr 7882 df-plr 7883 df-mr 7884 df-0r 7886 df-1r 7887 df-m1r 7888 df-c 7973 df-1 7975 df-r 7977 df-mul 7979 |
| This theorem is referenced by: rereceu 8044 recriota 8045 |
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