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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 8230. (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 8133 | . 2 ⊢ ℝ = (R × {0R}) | |
| 2 | oveq1 6056 | . . 3 ⊢ (〈𝑥, 𝑦〉 = 𝐴 → (〈𝑥, 𝑦〉 · 1) = (𝐴 · 1)) | |
| 3 | id 19 | . . 3 ⊢ (〈𝑥, 𝑦〉 = 𝐴 → 〈𝑥, 𝑦〉 = 𝐴) | |
| 4 | 2, 3 | eqeq12d 2247 | . 2 ⊢ (〈𝑥, 𝑦〉 = 𝐴 → ((〈𝑥, 𝑦〉 · 1) = 〈𝑥, 𝑦〉 ↔ (𝐴 · 1) = 𝐴)) |
| 5 | elsni 3706 | . . 3 ⊢ (𝑦 ∈ {0R} → 𝑦 = 0R) | |
| 6 | df-1 8131 | . . . . . . 7 ⊢ 1 = 〈1R, 0R〉 | |
| 7 | 6 | oveq2i 6060 | . . . . . 6 ⊢ (〈𝑥, 0R〉 · 1) = (〈𝑥, 0R〉 · 〈1R, 0R〉) |
| 8 | 1sr 8062 | . . . . . . . 8 ⊢ 1R ∈ R | |
| 9 | mulresr 8149 | . . . . . . . 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 8079 | . . . . . . . 8 ⊢ (𝑥 ∈ R → (𝑥 ·R 1R) = 𝑥) | |
| 12 | 11 | opeq1d 3888 | . . . . . . 7 ⊢ (𝑥 ∈ R → 〈(𝑥 ·R 1R), 0R〉 = 〈𝑥, 0R〉) |
| 13 | 10, 12 | eqtrd 2265 | . . . . . 6 ⊢ (𝑥 ∈ R → (〈𝑥, 0R〉 · 〈1R, 0R〉) = 〈𝑥, 0R〉) |
| 14 | 7, 13 | eqtrid 2277 | . . . . 5 ⊢ (𝑥 ∈ R → (〈𝑥, 0R〉 · 1) = 〈𝑥, 0R〉) |
| 15 | opeq2 3883 | . . . . . . 7 ⊢ (𝑦 = 0R → 〈𝑥, 𝑦〉 = 〈𝑥, 0R〉) | |
| 16 | 15 | oveq1d 6064 | . . . . . 6 ⊢ (𝑦 = 0R → (〈𝑥, 𝑦〉 · 1) = (〈𝑥, 0R〉 · 1)) |
| 17 | 16, 15 | eqeq12d 2247 | . . . . 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 4825 | 1 ⊢ (𝐴 ∈ ℝ → (𝐴 · 1) = 𝐴) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 = wceq 1398 ∈ wcel 2203 {csn 3688 〈cop 3691 (class class class)co 6049 Rcnr 7608 0Rc0r 7609 1Rc1r 7610 ·R cmr 7613 ℝcr 8122 1c1 8124 · cmul 8128 |
| 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 2205 ax-14 2206 ax-ext 2214 ax-coll 4224 ax-sep 4227 ax-nul 4235 ax-pow 4286 ax-pr 4321 ax-un 4553 ax-setind 4658 ax-iinf 4709 |
| 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 2083 df-mo 2084 df-clab 2219 df-cleq 2225 df-clel 2228 df-nfc 2373 df-ne 2413 df-ral 2525 df-rex 2526 df-reu 2527 df-rab 2529 df-v 2814 df-sbc 3042 df-csb 3138 df-dif 3212 df-un 3214 df-in 3216 df-ss 3223 df-nul 3508 df-pw 3670 df-sn 3694 df-pr 3695 df-op 3697 df-uni 3914 df-int 3949 df-iun 3992 df-br 4109 df-opab 4171 df-mpt 4172 df-tr 4208 df-eprel 4409 df-id 4413 df-po 4416 df-iso 4417 df-iord 4486 df-on 4488 df-suc 4491 df-iom 4712 df-xp 4754 df-rel 4755 df-cnv 4756 df-co 4757 df-dm 4758 df-rn 4759 df-res 4760 df-ima 4761 df-iota 5311 df-fun 5353 df-fn 5354 df-f 5355 df-f1 5356 df-fo 5357 df-f1o 5358 df-fv 5359 df-ov 6052 df-oprab 6053 df-mpo 6054 df-1st 6333 df-2nd 6334 df-recs 6535 df-irdg 6600 df-1o 6646 df-2o 6647 df-oadd 6650 df-omul 6651 df-er 6766 df-ec 6768 df-qs 6772 df-ni 7615 df-pli 7616 df-mi 7617 df-lti 7618 df-plpq 7655 df-mpq 7656 df-enq 7658 df-nqqs 7659 df-plqqs 7660 df-mqqs 7661 df-1nqqs 7662 df-rq 7663 df-ltnqqs 7664 df-enq0 7735 df-nq0 7736 df-0nq0 7737 df-plq0 7738 df-mq0 7739 df-inp 7777 df-i1p 7778 df-iplp 7779 df-imp 7780 df-enr 8037 df-nr 8038 df-plr 8039 df-mr 8040 df-0r 8042 df-1r 8043 df-m1r 8044 df-c 8129 df-1 8131 df-r 8133 df-mul 8135 |
| This theorem is referenced by: rereceu 8200 recriota 8201 |
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