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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 8039. (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 7942 | . 2 ⊢ ℝ = (R × {0R}) | |
| 2 | oveq1 5958 | . . 3 ⊢ (〈𝑥, 𝑦〉 = 𝐴 → (〈𝑥, 𝑦〉 · 1) = (𝐴 · 1)) | |
| 3 | id 19 | . . 3 ⊢ (〈𝑥, 𝑦〉 = 𝐴 → 〈𝑥, 𝑦〉 = 𝐴) | |
| 4 | 2, 3 | eqeq12d 2221 | . 2 ⊢ (〈𝑥, 𝑦〉 = 𝐴 → ((〈𝑥, 𝑦〉 · 1) = 〈𝑥, 𝑦〉 ↔ (𝐴 · 1) = 𝐴)) |
| 5 | elsni 3652 | . . 3 ⊢ (𝑦 ∈ {0R} → 𝑦 = 0R) | |
| 6 | df-1 7940 | . . . . . . 7 ⊢ 1 = 〈1R, 0R〉 | |
| 7 | 6 | oveq2i 5962 | . . . . . 6 ⊢ (〈𝑥, 0R〉 · 1) = (〈𝑥, 0R〉 · 〈1R, 0R〉) |
| 8 | 1sr 7871 | . . . . . . . 8 ⊢ 1R ∈ R | |
| 9 | mulresr 7958 | . . . . . . . 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 7888 | . . . . . . . 8 ⊢ (𝑥 ∈ R → (𝑥 ·R 1R) = 𝑥) | |
| 12 | 11 | opeq1d 3827 | . . . . . . 7 ⊢ (𝑥 ∈ R → 〈(𝑥 ·R 1R), 0R〉 = 〈𝑥, 0R〉) |
| 13 | 10, 12 | eqtrd 2239 | . . . . . 6 ⊢ (𝑥 ∈ R → (〈𝑥, 0R〉 · 〈1R, 0R〉) = 〈𝑥, 0R〉) |
| 14 | 7, 13 | eqtrid 2251 | . . . . 5 ⊢ (𝑥 ∈ R → (〈𝑥, 0R〉 · 1) = 〈𝑥, 0R〉) |
| 15 | opeq2 3822 | . . . . . . 7 ⊢ (𝑦 = 0R → 〈𝑥, 𝑦〉 = 〈𝑥, 0R〉) | |
| 16 | 15 | oveq1d 5966 | . . . . . 6 ⊢ (𝑦 = 0R → (〈𝑥, 𝑦〉 · 1) = (〈𝑥, 0R〉 · 1)) |
| 17 | 16, 15 | eqeq12d 2221 | . . . . 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 4755 | 1 ⊢ (𝐴 ∈ ℝ → (𝐴 · 1) = 𝐴) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 = wceq 1373 ∈ wcel 2177 {csn 3634 〈cop 3637 (class class class)co 5951 Rcnr 7417 0Rc0r 7418 1Rc1r 7419 ·R cmr 7422 ℝcr 7931 1c1 7933 · cmul 7937 |
| 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 615 ax-in2 616 ax-io 711 ax-5 1471 ax-7 1472 ax-gen 1473 ax-ie1 1517 ax-ie2 1518 ax-8 1528 ax-10 1529 ax-11 1530 ax-i12 1531 ax-bndl 1533 ax-4 1534 ax-17 1550 ax-i9 1554 ax-ial 1558 ax-i5r 1559 ax-13 2179 ax-14 2180 ax-ext 2188 ax-coll 4163 ax-sep 4166 ax-nul 4174 ax-pow 4222 ax-pr 4257 ax-un 4484 ax-setind 4589 ax-iinf 4640 |
| This theorem depends on definitions: df-bi 117 df-dc 837 df-3or 982 df-3an 983 df-tru 1376 df-fal 1379 df-nf 1485 df-sb 1787 df-eu 2058 df-mo 2059 df-clab 2193 df-cleq 2199 df-clel 2202 df-nfc 2338 df-ne 2378 df-ral 2490 df-rex 2491 df-reu 2492 df-rab 2494 df-v 2775 df-sbc 3000 df-csb 3095 df-dif 3169 df-un 3171 df-in 3173 df-ss 3180 df-nul 3462 df-pw 3619 df-sn 3640 df-pr 3641 df-op 3643 df-uni 3853 df-int 3888 df-iun 3931 df-br 4048 df-opab 4110 df-mpt 4111 df-tr 4147 df-eprel 4340 df-id 4344 df-po 4347 df-iso 4348 df-iord 4417 df-on 4419 df-suc 4422 df-iom 4643 df-xp 4685 df-rel 4686 df-cnv 4687 df-co 4688 df-dm 4689 df-rn 4690 df-res 4691 df-ima 4692 df-iota 5237 df-fun 5278 df-fn 5279 df-f 5280 df-f1 5281 df-fo 5282 df-f1o 5283 df-fv 5284 df-ov 5954 df-oprab 5955 df-mpo 5956 df-1st 6233 df-2nd 6234 df-recs 6398 df-irdg 6463 df-1o 6509 df-2o 6510 df-oadd 6513 df-omul 6514 df-er 6627 df-ec 6629 df-qs 6633 df-ni 7424 df-pli 7425 df-mi 7426 df-lti 7427 df-plpq 7464 df-mpq 7465 df-enq 7467 df-nqqs 7468 df-plqqs 7469 df-mqqs 7470 df-1nqqs 7471 df-rq 7472 df-ltnqqs 7473 df-enq0 7544 df-nq0 7545 df-0nq0 7546 df-plq0 7547 df-mq0 7548 df-inp 7586 df-i1p 7587 df-iplp 7588 df-imp 7589 df-enr 7846 df-nr 7847 df-plr 7848 df-mr 7849 df-0r 7851 df-1r 7852 df-m1r 7853 df-c 7938 df-1 7940 df-r 7942 df-mul 7944 |
| This theorem is referenced by: rereceu 8009 recriota 8010 |
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