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Description: A left multiplicative inverse is a right multiplicative inverse. Proven without ax-mulcom . (Contributed by SN, 5-Feb-2024)
| Ref | Expression | ||
|---|---|---|---|
| Hypotheses | remulinvcom.1 | ⊢ ( 𝜑 → 𝐴 ∈ ℝ ) | |
| remulinvcom.2 | ⊢ ( 𝜑 → 𝐵 ∈ ℝ ) | ||
| remulinvcom.3 | ⊢ ( 𝜑 → ( 𝐴 · 𝐵 ) = 1 ) | ||
| Assertion | remulinvcom | ⊢ ( 𝜑 → ( 𝐵 · 𝐴 ) = 1 ) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | remulinvcom.1 | ⊢ ( 𝜑 → 𝐴 ∈ ℝ ) | |
| 2 | remulinvcom.2 | ⊢ ( 𝜑 → 𝐵 ∈ ℝ ) | |
| 3 | remulinvcom.3 | ⊢ ( 𝜑 → ( 𝐴 · 𝐵 ) = 1 ) | |
| 4 | ax-1ne0 | ⊢ 1 ≠ 0 | |
| 5 | 4 | a1i | ⊢ ( 𝜑 → 1 ≠ 0 ) |
| 6 | 3 5 | eqnetrd | ⊢ ( 𝜑 → ( 𝐴 · 𝐵 ) ≠ 0 ) |
| 7 | simpr | ⊢ ( ( 𝜑 ∧ 𝐵 = 0 ) → 𝐵 = 0 ) | |
| 8 | 7 | oveq2d | ⊢ ( ( 𝜑 ∧ 𝐵 = 0 ) → ( 𝐴 · 𝐵 ) = ( 𝐴 · 0 ) ) |
| 9 | 1 | adantr | ⊢ ( ( 𝜑 ∧ 𝐵 = 0 ) → 𝐴 ∈ ℝ ) |
| 10 | remul01 | ⊢ ( 𝐴 ∈ ℝ → ( 𝐴 · 0 ) = 0 ) | |
| 11 | 9 10 | syl | ⊢ ( ( 𝜑 ∧ 𝐵 = 0 ) → ( 𝐴 · 0 ) = 0 ) |
| 12 | 8 11 | eqtrd | ⊢ ( ( 𝜑 ∧ 𝐵 = 0 ) → ( 𝐴 · 𝐵 ) = 0 ) |
| 13 | 6 12 | mteqand | ⊢ ( 𝜑 → 𝐵 ≠ 0 ) |
| 14 | ax-rrecex | ⊢ ( ( 𝐵 ∈ ℝ ∧ 𝐵 ≠ 0 ) → ∃ 𝑥 ∈ ℝ ( 𝐵 · 𝑥 ) = 1 ) | |
| 15 | 2 13 14 | syl2anc | ⊢ ( 𝜑 → ∃ 𝑥 ∈ ℝ ( 𝐵 · 𝑥 ) = 1 ) |
| 16 | simprl | ⊢ ( ( 𝜑 ∧ ( 𝑥 ∈ ℝ ∧ ( 𝐵 · 𝑥 ) = 1 ) ) → 𝑥 ∈ ℝ ) | |
| 17 | simprr | ⊢ ( ( 𝜑 ∧ ( 𝑥 ∈ ℝ ∧ ( 𝐵 · 𝑥 ) = 1 ) ) → ( 𝐵 · 𝑥 ) = 1 ) | |
| 18 | 4 | a1i | ⊢ ( ( 𝜑 ∧ ( 𝑥 ∈ ℝ ∧ ( 𝐵 · 𝑥 ) = 1 ) ) → 1 ≠ 0 ) |
| 19 | 17 18 | eqnetrd | ⊢ ( ( 𝜑 ∧ ( 𝑥 ∈ ℝ ∧ ( 𝐵 · 𝑥 ) = 1 ) ) → ( 𝐵 · 𝑥 ) ≠ 0 ) |
| 20 | simpr | ⊢ ( ( ( 𝜑 ∧ ( 𝑥 ∈ ℝ ∧ ( 𝐵 · 𝑥 ) = 1 ) ) ∧ 𝑥 = 0 ) → 𝑥 = 0 ) | |
| 21 | 20 | oveq2d | ⊢ ( ( ( 𝜑 ∧ ( 𝑥 ∈ ℝ ∧ ( 𝐵 · 𝑥 ) = 1 ) ) ∧ 𝑥 = 0 ) → ( 𝐵 · 𝑥 ) = ( 𝐵 · 0 ) ) |
| 22 | 2 | ad2antrr | ⊢ ( ( ( 𝜑 ∧ ( 𝑥 ∈ ℝ ∧ ( 𝐵 · 𝑥 ) = 1 ) ) ∧ 𝑥 = 0 ) → 𝐵 ∈ ℝ ) |
| 23 | remul01 | ⊢ ( 𝐵 ∈ ℝ → ( 𝐵 · 0 ) = 0 ) | |
| 24 | 22 23 | syl | ⊢ ( ( ( 𝜑 ∧ ( 𝑥 ∈ ℝ ∧ ( 𝐵 · 𝑥 ) = 1 ) ) ∧ 𝑥 = 0 ) → ( 𝐵 · 0 ) = 0 ) |
| 25 | 21 24 | eqtrd | ⊢ ( ( ( 𝜑 ∧ ( 𝑥 ∈ ℝ ∧ ( 𝐵 · 𝑥 ) = 1 ) ) ∧ 𝑥 = 0 ) → ( 𝐵 · 𝑥 ) = 0 ) |
| 26 | 19 25 | mteqand | ⊢ ( ( 𝜑 ∧ ( 𝑥 ∈ ℝ ∧ ( 𝐵 · 𝑥 ) = 1 ) ) → 𝑥 ≠ 0 ) |
| 27 | ax-rrecex | ⊢ ( ( 𝑥 ∈ ℝ ∧ 𝑥 ≠ 0 ) → ∃ 𝑦 ∈ ℝ ( 𝑥 · 𝑦 ) = 1 ) | |
| 28 | 16 26 27 | syl2anc | ⊢ ( ( 𝜑 ∧ ( 𝑥 ∈ ℝ ∧ ( 𝐵 · 𝑥 ) = 1 ) ) → ∃ 𝑦 ∈ ℝ ( 𝑥 · 𝑦 ) = 1 ) |
| 29 | simplrr | ⊢ ( ( ( 𝜑 ∧ ( 𝑥 ∈ ℝ ∧ ( 𝐵 · 𝑥 ) = 1 ) ) ∧ ( 𝑦 ∈ ℝ ∧ ( 𝑥 · 𝑦 ) = 1 ) ) → ( 𝐵 · 𝑥 ) = 1 ) | |
| 30 | 29 | oveq2d | ⊢ ( ( ( 𝜑 ∧ ( 𝑥 ∈ ℝ ∧ ( 𝐵 · 𝑥 ) = 1 ) ) ∧ ( 𝑦 ∈ ℝ ∧ ( 𝑥 · 𝑦 ) = 1 ) ) → ( 𝐴 · ( 𝐵 · 𝑥 ) ) = ( 𝐴 · 1 ) ) |
| 31 | 30 | oveq1d | ⊢ ( ( ( 𝜑 ∧ ( 𝑥 ∈ ℝ ∧ ( 𝐵 · 𝑥 ) = 1 ) ) ∧ ( 𝑦 ∈ ℝ ∧ ( 𝑥 · 𝑦 ) = 1 ) ) → ( ( 𝐴 · ( 𝐵 · 𝑥 ) ) · 𝑦 ) = ( ( 𝐴 · 1 ) · 𝑦 ) ) |
| 32 | 1 | ad2antrr | ⊢ ( ( ( 𝜑 ∧ ( 𝑥 ∈ ℝ ∧ ( 𝐵 · 𝑥 ) = 1 ) ) ∧ ( 𝑦 ∈ ℝ ∧ ( 𝑥 · 𝑦 ) = 1 ) ) → 𝐴 ∈ ℝ ) |
| 33 | 2 | ad2antrr | ⊢ ( ( ( 𝜑 ∧ ( 𝑥 ∈ ℝ ∧ ( 𝐵 · 𝑥 ) = 1 ) ) ∧ ( 𝑦 ∈ ℝ ∧ ( 𝑥 · 𝑦 ) = 1 ) ) → 𝐵 ∈ ℝ ) |
| 34 | 32 33 | remulcld | ⊢ ( ( ( 𝜑 ∧ ( 𝑥 ∈ ℝ ∧ ( 𝐵 · 𝑥 ) = 1 ) ) ∧ ( 𝑦 ∈ ℝ ∧ ( 𝑥 · 𝑦 ) = 1 ) ) → ( 𝐴 · 𝐵 ) ∈ ℝ ) |
| 35 | 34 | recnd | ⊢ ( ( ( 𝜑 ∧ ( 𝑥 ∈ ℝ ∧ ( 𝐵 · 𝑥 ) = 1 ) ) ∧ ( 𝑦 ∈ ℝ ∧ ( 𝑥 · 𝑦 ) = 1 ) ) → ( 𝐴 · 𝐵 ) ∈ ℂ ) |
| 36 | simplrl | ⊢ ( ( ( 𝜑 ∧ ( 𝑥 ∈ ℝ ∧ ( 𝐵 · 𝑥 ) = 1 ) ) ∧ ( 𝑦 ∈ ℝ ∧ ( 𝑥 · 𝑦 ) = 1 ) ) → 𝑥 ∈ ℝ ) | |
| 37 | 36 | recnd | ⊢ ( ( ( 𝜑 ∧ ( 𝑥 ∈ ℝ ∧ ( 𝐵 · 𝑥 ) = 1 ) ) ∧ ( 𝑦 ∈ ℝ ∧ ( 𝑥 · 𝑦 ) = 1 ) ) → 𝑥 ∈ ℂ ) |
| 38 | simprl | ⊢ ( ( ( 𝜑 ∧ ( 𝑥 ∈ ℝ ∧ ( 𝐵 · 𝑥 ) = 1 ) ) ∧ ( 𝑦 ∈ ℝ ∧ ( 𝑥 · 𝑦 ) = 1 ) ) → 𝑦 ∈ ℝ ) | |
| 39 | 38 | recnd | ⊢ ( ( ( 𝜑 ∧ ( 𝑥 ∈ ℝ ∧ ( 𝐵 · 𝑥 ) = 1 ) ) ∧ ( 𝑦 ∈ ℝ ∧ ( 𝑥 · 𝑦 ) = 1 ) ) → 𝑦 ∈ ℂ ) |
| 40 | 35 37 39 | mulassd | ⊢ ( ( ( 𝜑 ∧ ( 𝑥 ∈ ℝ ∧ ( 𝐵 · 𝑥 ) = 1 ) ) ∧ ( 𝑦 ∈ ℝ ∧ ( 𝑥 · 𝑦 ) = 1 ) ) → ( ( ( 𝐴 · 𝐵 ) · 𝑥 ) · 𝑦 ) = ( ( 𝐴 · 𝐵 ) · ( 𝑥 · 𝑦 ) ) ) |
| 41 | 32 | recnd | ⊢ ( ( ( 𝜑 ∧ ( 𝑥 ∈ ℝ ∧ ( 𝐵 · 𝑥 ) = 1 ) ) ∧ ( 𝑦 ∈ ℝ ∧ ( 𝑥 · 𝑦 ) = 1 ) ) → 𝐴 ∈ ℂ ) |
| 42 | 33 | recnd | ⊢ ( ( ( 𝜑 ∧ ( 𝑥 ∈ ℝ ∧ ( 𝐵 · 𝑥 ) = 1 ) ) ∧ ( 𝑦 ∈ ℝ ∧ ( 𝑥 · 𝑦 ) = 1 ) ) → 𝐵 ∈ ℂ ) |
| 43 | 41 42 37 | mulassd | ⊢ ( ( ( 𝜑 ∧ ( 𝑥 ∈ ℝ ∧ ( 𝐵 · 𝑥 ) = 1 ) ) ∧ ( 𝑦 ∈ ℝ ∧ ( 𝑥 · 𝑦 ) = 1 ) ) → ( ( 𝐴 · 𝐵 ) · 𝑥 ) = ( 𝐴 · ( 𝐵 · 𝑥 ) ) ) |
| 44 | 43 | oveq1d | ⊢ ( ( ( 𝜑 ∧ ( 𝑥 ∈ ℝ ∧ ( 𝐵 · 𝑥 ) = 1 ) ) ∧ ( 𝑦 ∈ ℝ ∧ ( 𝑥 · 𝑦 ) = 1 ) ) → ( ( ( 𝐴 · 𝐵 ) · 𝑥 ) · 𝑦 ) = ( ( 𝐴 · ( 𝐵 · 𝑥 ) ) · 𝑦 ) ) |
| 45 | 3 | ad2antrr | ⊢ ( ( ( 𝜑 ∧ ( 𝑥 ∈ ℝ ∧ ( 𝐵 · 𝑥 ) = 1 ) ) ∧ ( 𝑦 ∈ ℝ ∧ ( 𝑥 · 𝑦 ) = 1 ) ) → ( 𝐴 · 𝐵 ) = 1 ) |
| 46 | simprr | ⊢ ( ( ( 𝜑 ∧ ( 𝑥 ∈ ℝ ∧ ( 𝐵 · 𝑥 ) = 1 ) ) ∧ ( 𝑦 ∈ ℝ ∧ ( 𝑥 · 𝑦 ) = 1 ) ) → ( 𝑥 · 𝑦 ) = 1 ) | |
| 47 | 45 46 | oveq12d | ⊢ ( ( ( 𝜑 ∧ ( 𝑥 ∈ ℝ ∧ ( 𝐵 · 𝑥 ) = 1 ) ) ∧ ( 𝑦 ∈ ℝ ∧ ( 𝑥 · 𝑦 ) = 1 ) ) → ( ( 𝐴 · 𝐵 ) · ( 𝑥 · 𝑦 ) ) = ( 1 · 1 ) ) |
| 48 | 1t1e1ALT | ⊢ ( 1 · 1 ) = 1 | |
| 49 | 47 48 | eqtrdi | ⊢ ( ( ( 𝜑 ∧ ( 𝑥 ∈ ℝ ∧ ( 𝐵 · 𝑥 ) = 1 ) ) ∧ ( 𝑦 ∈ ℝ ∧ ( 𝑥 · 𝑦 ) = 1 ) ) → ( ( 𝐴 · 𝐵 ) · ( 𝑥 · 𝑦 ) ) = 1 ) |
| 50 | 40 44 49 | 3eqtr3d | ⊢ ( ( ( 𝜑 ∧ ( 𝑥 ∈ ℝ ∧ ( 𝐵 · 𝑥 ) = 1 ) ) ∧ ( 𝑦 ∈ ℝ ∧ ( 𝑥 · 𝑦 ) = 1 ) ) → ( ( 𝐴 · ( 𝐵 · 𝑥 ) ) · 𝑦 ) = 1 ) |
| 51 | ax-1rid | ⊢ ( 𝐴 ∈ ℝ → ( 𝐴 · 1 ) = 𝐴 ) | |
| 52 | 32 51 | syl | ⊢ ( ( ( 𝜑 ∧ ( 𝑥 ∈ ℝ ∧ ( 𝐵 · 𝑥 ) = 1 ) ) ∧ ( 𝑦 ∈ ℝ ∧ ( 𝑥 · 𝑦 ) = 1 ) ) → ( 𝐴 · 1 ) = 𝐴 ) |
| 53 | 52 | oveq1d | ⊢ ( ( ( 𝜑 ∧ ( 𝑥 ∈ ℝ ∧ ( 𝐵 · 𝑥 ) = 1 ) ) ∧ ( 𝑦 ∈ ℝ ∧ ( 𝑥 · 𝑦 ) = 1 ) ) → ( ( 𝐴 · 1 ) · 𝑦 ) = ( 𝐴 · 𝑦 ) ) |
| 54 | 31 50 53 | 3eqtr3rd | ⊢ ( ( ( 𝜑 ∧ ( 𝑥 ∈ ℝ ∧ ( 𝐵 · 𝑥 ) = 1 ) ) ∧ ( 𝑦 ∈ ℝ ∧ ( 𝑥 · 𝑦 ) = 1 ) ) → ( 𝐴 · 𝑦 ) = 1 ) |
| 55 | 54 46 | eqtr4d | ⊢ ( ( ( 𝜑 ∧ ( 𝑥 ∈ ℝ ∧ ( 𝐵 · 𝑥 ) = 1 ) ) ∧ ( 𝑦 ∈ ℝ ∧ ( 𝑥 · 𝑦 ) = 1 ) ) → ( 𝐴 · 𝑦 ) = ( 𝑥 · 𝑦 ) ) |
| 56 | 4 | a1i | ⊢ ( ( ( 𝜑 ∧ ( 𝑥 ∈ ℝ ∧ ( 𝐵 · 𝑥 ) = 1 ) ) ∧ ( 𝑦 ∈ ℝ ∧ ( 𝑥 · 𝑦 ) = 1 ) ) → 1 ≠ 0 ) |
| 57 | 46 56 | eqnetrd | ⊢ ( ( ( 𝜑 ∧ ( 𝑥 ∈ ℝ ∧ ( 𝐵 · 𝑥 ) = 1 ) ) ∧ ( 𝑦 ∈ ℝ ∧ ( 𝑥 · 𝑦 ) = 1 ) ) → ( 𝑥 · 𝑦 ) ≠ 0 ) |
| 58 | simpr | ⊢ ( ( ( ( 𝜑 ∧ ( 𝑥 ∈ ℝ ∧ ( 𝐵 · 𝑥 ) = 1 ) ) ∧ ( 𝑦 ∈ ℝ ∧ ( 𝑥 · 𝑦 ) = 1 ) ) ∧ 𝑦 = 0 ) → 𝑦 = 0 ) | |
| 59 | 58 | oveq2d | ⊢ ( ( ( ( 𝜑 ∧ ( 𝑥 ∈ ℝ ∧ ( 𝐵 · 𝑥 ) = 1 ) ) ∧ ( 𝑦 ∈ ℝ ∧ ( 𝑥 · 𝑦 ) = 1 ) ) ∧ 𝑦 = 0 ) → ( 𝑥 · 𝑦 ) = ( 𝑥 · 0 ) ) |
| 60 | 36 | adantr | ⊢ ( ( ( ( 𝜑 ∧ ( 𝑥 ∈ ℝ ∧ ( 𝐵 · 𝑥 ) = 1 ) ) ∧ ( 𝑦 ∈ ℝ ∧ ( 𝑥 · 𝑦 ) = 1 ) ) ∧ 𝑦 = 0 ) → 𝑥 ∈ ℝ ) |
| 61 | remul01 | ⊢ ( 𝑥 ∈ ℝ → ( 𝑥 · 0 ) = 0 ) | |
| 62 | 60 61 | syl | ⊢ ( ( ( ( 𝜑 ∧ ( 𝑥 ∈ ℝ ∧ ( 𝐵 · 𝑥 ) = 1 ) ) ∧ ( 𝑦 ∈ ℝ ∧ ( 𝑥 · 𝑦 ) = 1 ) ) ∧ 𝑦 = 0 ) → ( 𝑥 · 0 ) = 0 ) |
| 63 | 59 62 | eqtrd | ⊢ ( ( ( ( 𝜑 ∧ ( 𝑥 ∈ ℝ ∧ ( 𝐵 · 𝑥 ) = 1 ) ) ∧ ( 𝑦 ∈ ℝ ∧ ( 𝑥 · 𝑦 ) = 1 ) ) ∧ 𝑦 = 0 ) → ( 𝑥 · 𝑦 ) = 0 ) |
| 64 | 57 63 | mteqand | ⊢ ( ( ( 𝜑 ∧ ( 𝑥 ∈ ℝ ∧ ( 𝐵 · 𝑥 ) = 1 ) ) ∧ ( 𝑦 ∈ ℝ ∧ ( 𝑥 · 𝑦 ) = 1 ) ) → 𝑦 ≠ 0 ) |
| 65 | 32 36 38 64 | remulcan2d | ⊢ ( ( ( 𝜑 ∧ ( 𝑥 ∈ ℝ ∧ ( 𝐵 · 𝑥 ) = 1 ) ) ∧ ( 𝑦 ∈ ℝ ∧ ( 𝑥 · 𝑦 ) = 1 ) ) → ( ( 𝐴 · 𝑦 ) = ( 𝑥 · 𝑦 ) ↔ 𝐴 = 𝑥 ) ) |
| 66 | 55 65 | mpbid | ⊢ ( ( ( 𝜑 ∧ ( 𝑥 ∈ ℝ ∧ ( 𝐵 · 𝑥 ) = 1 ) ) ∧ ( 𝑦 ∈ ℝ ∧ ( 𝑥 · 𝑦 ) = 1 ) ) → 𝐴 = 𝑥 ) |
| 67 | simpr | ⊢ ( ( ( ( 𝜑 ∧ ( 𝑥 ∈ ℝ ∧ ( 𝐵 · 𝑥 ) = 1 ) ) ∧ ( 𝑦 ∈ ℝ ∧ ( 𝑥 · 𝑦 ) = 1 ) ) ∧ 𝐴 = 𝑥 ) → 𝐴 = 𝑥 ) | |
| 68 | 67 | oveq2d | ⊢ ( ( ( ( 𝜑 ∧ ( 𝑥 ∈ ℝ ∧ ( 𝐵 · 𝑥 ) = 1 ) ) ∧ ( 𝑦 ∈ ℝ ∧ ( 𝑥 · 𝑦 ) = 1 ) ) ∧ 𝐴 = 𝑥 ) → ( 𝐵 · 𝐴 ) = ( 𝐵 · 𝑥 ) ) |
| 69 | 17 | ad2antrr | ⊢ ( ( ( ( 𝜑 ∧ ( 𝑥 ∈ ℝ ∧ ( 𝐵 · 𝑥 ) = 1 ) ) ∧ ( 𝑦 ∈ ℝ ∧ ( 𝑥 · 𝑦 ) = 1 ) ) ∧ 𝐴 = 𝑥 ) → ( 𝐵 · 𝑥 ) = 1 ) |
| 70 | 68 69 | eqtrd | ⊢ ( ( ( ( 𝜑 ∧ ( 𝑥 ∈ ℝ ∧ ( 𝐵 · 𝑥 ) = 1 ) ) ∧ ( 𝑦 ∈ ℝ ∧ ( 𝑥 · 𝑦 ) = 1 ) ) ∧ 𝐴 = 𝑥 ) → ( 𝐵 · 𝐴 ) = 1 ) |
| 71 | 66 70 | mpdan | ⊢ ( ( ( 𝜑 ∧ ( 𝑥 ∈ ℝ ∧ ( 𝐵 · 𝑥 ) = 1 ) ) ∧ ( 𝑦 ∈ ℝ ∧ ( 𝑥 · 𝑦 ) = 1 ) ) → ( 𝐵 · 𝐴 ) = 1 ) |
| 72 | 28 71 | rexlimddv | ⊢ ( ( 𝜑 ∧ ( 𝑥 ∈ ℝ ∧ ( 𝐵 · 𝑥 ) = 1 ) ) → ( 𝐵 · 𝐴 ) = 1 ) |
| 73 | 15 72 | rexlimddv | ⊢ ( 𝜑 → ( 𝐵 · 𝐴 ) = 1 ) |