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Description: The reals in the expression given by cnre uniquely define a complex number. (Contributed by SN, 27-Jun-2024)
| Ref | Expression | ||
|---|---|---|---|
| Hypotheses | cnreeu.r | ⊢ ( 𝜑 → 𝑟 ∈ ℝ ) | |
| cnreeu.s | ⊢ ( 𝜑 → 𝑠 ∈ ℝ ) | ||
| cnreeu.t | ⊢ ( 𝜑 → 𝑡 ∈ ℝ ) | ||
| cnreeu.u | ⊢ ( 𝜑 → 𝑢 ∈ ℝ ) | ||
| Assertion | cnreeu | ⊢ ( 𝜑 → ( ( 𝑟 + ( i · 𝑠 ) ) = ( 𝑡 + ( i · 𝑢 ) ) ↔ ( 𝑟 = 𝑡 ∧ 𝑠 = 𝑢 ) ) ) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | cnreeu.r | ⊢ ( 𝜑 → 𝑟 ∈ ℝ ) | |
| 2 | cnreeu.s | ⊢ ( 𝜑 → 𝑠 ∈ ℝ ) | |
| 3 | cnreeu.t | ⊢ ( 𝜑 → 𝑡 ∈ ℝ ) | |
| 4 | cnreeu.u | ⊢ ( 𝜑 → 𝑢 ∈ ℝ ) | |
| 5 | oveq1 | ⊢ ( ( 𝑟 + ( i · 𝑠 ) ) = ( 𝑡 + ( i · 𝑢 ) ) → ( ( 𝑟 + ( i · 𝑠 ) ) + ( i · ( 0 −ℝ 𝑠 ) ) ) = ( ( 𝑡 + ( i · 𝑢 ) ) + ( i · ( 0 −ℝ 𝑠 ) ) ) ) | |
| 6 | 5 | oveq2d | ⊢ ( ( 𝑟 + ( i · 𝑠 ) ) = ( 𝑡 + ( i · 𝑢 ) ) → ( ( 0 −ℝ 𝑡 ) + ( ( 𝑟 + ( i · 𝑠 ) ) + ( i · ( 0 −ℝ 𝑠 ) ) ) ) = ( ( 0 −ℝ 𝑡 ) + ( ( 𝑡 + ( i · 𝑢 ) ) + ( i · ( 0 −ℝ 𝑠 ) ) ) ) ) |
| 7 | 1 | recnd | ⊢ ( 𝜑 → 𝑟 ∈ ℂ ) |
| 8 | ax-icn | ⊢ i ∈ ℂ | |
| 9 | 8 | a1i | ⊢ ( 𝜑 → i ∈ ℂ ) |
| 10 | 2 | recnd | ⊢ ( 𝜑 → 𝑠 ∈ ℂ ) |
| 11 | 9 10 | mulcld | ⊢ ( 𝜑 → ( i · 𝑠 ) ∈ ℂ ) |
| 12 | rernegcl | ⊢ ( 𝑠 ∈ ℝ → ( 0 −ℝ 𝑠 ) ∈ ℝ ) | |
| 13 | 2 12 | syl | ⊢ ( 𝜑 → ( 0 −ℝ 𝑠 ) ∈ ℝ ) |
| 14 | 13 | recnd | ⊢ ( 𝜑 → ( 0 −ℝ 𝑠 ) ∈ ℂ ) |
| 15 | 9 14 | mulcld | ⊢ ( 𝜑 → ( i · ( 0 −ℝ 𝑠 ) ) ∈ ℂ ) |
| 16 | 7 11 15 | addassd | ⊢ ( 𝜑 → ( ( 𝑟 + ( i · 𝑠 ) ) + ( i · ( 0 −ℝ 𝑠 ) ) ) = ( 𝑟 + ( ( i · 𝑠 ) + ( i · ( 0 −ℝ 𝑠 ) ) ) ) ) |
| 17 | renegid | ⊢ ( 𝑠 ∈ ℝ → ( 𝑠 + ( 0 −ℝ 𝑠 ) ) = 0 ) | |
| 18 | 2 17 | syl | ⊢ ( 𝜑 → ( 𝑠 + ( 0 −ℝ 𝑠 ) ) = 0 ) |
| 19 | 18 | oveq2d | ⊢ ( 𝜑 → ( i · ( 𝑠 + ( 0 −ℝ 𝑠 ) ) ) = ( i · 0 ) ) |
| 20 | 9 10 14 | adddid | ⊢ ( 𝜑 → ( i · ( 𝑠 + ( 0 −ℝ 𝑠 ) ) ) = ( ( i · 𝑠 ) + ( i · ( 0 −ℝ 𝑠 ) ) ) ) |
| 21 | sn-it0e0 | ⊢ ( i · 0 ) = 0 | |
| 22 | 21 | a1i | ⊢ ( 𝜑 → ( i · 0 ) = 0 ) |
| 23 | 19 20 22 | 3eqtr3d | ⊢ ( 𝜑 → ( ( i · 𝑠 ) + ( i · ( 0 −ℝ 𝑠 ) ) ) = 0 ) |
| 24 | 23 | oveq2d | ⊢ ( 𝜑 → ( 𝑟 + ( ( i · 𝑠 ) + ( i · ( 0 −ℝ 𝑠 ) ) ) ) = ( 𝑟 + 0 ) ) |
| 25 | readdrid | ⊢ ( 𝑟 ∈ ℝ → ( 𝑟 + 0 ) = 𝑟 ) | |
| 26 | 1 25 | syl | ⊢ ( 𝜑 → ( 𝑟 + 0 ) = 𝑟 ) |
| 27 | 16 24 26 | 3eqtrd | ⊢ ( 𝜑 → ( ( 𝑟 + ( i · 𝑠 ) ) + ( i · ( 0 −ℝ 𝑠 ) ) ) = 𝑟 ) |
| 28 | 27 | oveq2d | ⊢ ( 𝜑 → ( ( 0 −ℝ 𝑡 ) + ( ( 𝑟 + ( i · 𝑠 ) ) + ( i · ( 0 −ℝ 𝑠 ) ) ) ) = ( ( 0 −ℝ 𝑡 ) + 𝑟 ) ) |
| 29 | rernegcl | ⊢ ( 𝑡 ∈ ℝ → ( 0 −ℝ 𝑡 ) ∈ ℝ ) | |
| 30 | 3 29 | syl | ⊢ ( 𝜑 → ( 0 −ℝ 𝑡 ) ∈ ℝ ) |
| 31 | 30 | recnd | ⊢ ( 𝜑 → ( 0 −ℝ 𝑡 ) ∈ ℂ ) |
| 32 | 3 | recnd | ⊢ ( 𝜑 → 𝑡 ∈ ℂ ) |
| 33 | 4 | recnd | ⊢ ( 𝜑 → 𝑢 ∈ ℂ ) |
| 34 | 9 33 | mulcld | ⊢ ( 𝜑 → ( i · 𝑢 ) ∈ ℂ ) |
| 35 | 31 32 34 | addassd | ⊢ ( 𝜑 → ( ( ( 0 −ℝ 𝑡 ) + 𝑡 ) + ( i · 𝑢 ) ) = ( ( 0 −ℝ 𝑡 ) + ( 𝑡 + ( i · 𝑢 ) ) ) ) |
| 36 | 35 | oveq1d | ⊢ ( 𝜑 → ( ( ( ( 0 −ℝ 𝑡 ) + 𝑡 ) + ( i · 𝑢 ) ) + ( i · ( 0 −ℝ 𝑠 ) ) ) = ( ( ( 0 −ℝ 𝑡 ) + ( 𝑡 + ( i · 𝑢 ) ) ) + ( i · ( 0 −ℝ 𝑠 ) ) ) ) |
| 37 | sn-addlid | ⊢ ( ( i · 𝑢 ) ∈ ℂ → ( 0 + ( i · 𝑢 ) ) = ( i · 𝑢 ) ) | |
| 38 | 34 37 | syl | ⊢ ( 𝜑 → ( 0 + ( i · 𝑢 ) ) = ( i · 𝑢 ) ) |
| 39 | 38 | oveq1d | ⊢ ( 𝜑 → ( ( 0 + ( i · 𝑢 ) ) + ( i · ( 0 −ℝ 𝑠 ) ) ) = ( ( i · 𝑢 ) + ( i · ( 0 −ℝ 𝑠 ) ) ) ) |
| 40 | renegid2 | ⊢ ( 𝑡 ∈ ℝ → ( ( 0 −ℝ 𝑡 ) + 𝑡 ) = 0 ) | |
| 41 | 3 40 | syl | ⊢ ( 𝜑 → ( ( 0 −ℝ 𝑡 ) + 𝑡 ) = 0 ) |
| 42 | 41 | oveq1d | ⊢ ( 𝜑 → ( ( ( 0 −ℝ 𝑡 ) + 𝑡 ) + ( i · 𝑢 ) ) = ( 0 + ( i · 𝑢 ) ) ) |
| 43 | 42 | oveq1d | ⊢ ( 𝜑 → ( ( ( ( 0 −ℝ 𝑡 ) + 𝑡 ) + ( i · 𝑢 ) ) + ( i · ( 0 −ℝ 𝑠 ) ) ) = ( ( 0 + ( i · 𝑢 ) ) + ( i · ( 0 −ℝ 𝑠 ) ) ) ) |
| 44 | 9 33 14 | adddid | ⊢ ( 𝜑 → ( i · ( 𝑢 + ( 0 −ℝ 𝑠 ) ) ) = ( ( i · 𝑢 ) + ( i · ( 0 −ℝ 𝑠 ) ) ) ) |
| 45 | 39 43 44 | 3eqtr4d | ⊢ ( 𝜑 → ( ( ( ( 0 −ℝ 𝑡 ) + 𝑡 ) + ( i · 𝑢 ) ) + ( i · ( 0 −ℝ 𝑠 ) ) ) = ( i · ( 𝑢 + ( 0 −ℝ 𝑠 ) ) ) ) |
| 46 | 32 34 | addcld | ⊢ ( 𝜑 → ( 𝑡 + ( i · 𝑢 ) ) ∈ ℂ ) |
| 47 | 31 46 15 | addassd | ⊢ ( 𝜑 → ( ( ( 0 −ℝ 𝑡 ) + ( 𝑡 + ( i · 𝑢 ) ) ) + ( i · ( 0 −ℝ 𝑠 ) ) ) = ( ( 0 −ℝ 𝑡 ) + ( ( 𝑡 + ( i · 𝑢 ) ) + ( i · ( 0 −ℝ 𝑠 ) ) ) ) ) |
| 48 | 36 45 47 | 3eqtr3rd | ⊢ ( 𝜑 → ( ( 0 −ℝ 𝑡 ) + ( ( 𝑡 + ( i · 𝑢 ) ) + ( i · ( 0 −ℝ 𝑠 ) ) ) ) = ( i · ( 𝑢 + ( 0 −ℝ 𝑠 ) ) ) ) |
| 49 | 28 48 | eqeq12d | ⊢ ( 𝜑 → ( ( ( 0 −ℝ 𝑡 ) + ( ( 𝑟 + ( i · 𝑠 ) ) + ( i · ( 0 −ℝ 𝑠 ) ) ) ) = ( ( 0 −ℝ 𝑡 ) + ( ( 𝑡 + ( i · 𝑢 ) ) + ( i · ( 0 −ℝ 𝑠 ) ) ) ) ↔ ( ( 0 −ℝ 𝑡 ) + 𝑟 ) = ( i · ( 𝑢 + ( 0 −ℝ 𝑠 ) ) ) ) ) |
| 50 | 49 | biimpa | ⊢ ( ( 𝜑 ∧ ( ( 0 −ℝ 𝑡 ) + ( ( 𝑟 + ( i · 𝑠 ) ) + ( i · ( 0 −ℝ 𝑠 ) ) ) ) = ( ( 0 −ℝ 𝑡 ) + ( ( 𝑡 + ( i · 𝑢 ) ) + ( i · ( 0 −ℝ 𝑠 ) ) ) ) ) → ( ( 0 −ℝ 𝑡 ) + 𝑟 ) = ( i · ( 𝑢 + ( 0 −ℝ 𝑠 ) ) ) ) |
| 51 | simpr | ⊢ ( ( 𝜑 ∧ ( ( 0 −ℝ 𝑡 ) + 𝑟 ) = ( i · ( 𝑢 + ( 0 −ℝ 𝑠 ) ) ) ) → ( ( 0 −ℝ 𝑡 ) + 𝑟 ) = ( i · ( 𝑢 + ( 0 −ℝ 𝑠 ) ) ) ) | |
| 52 | 4 | adantr | ⊢ ( ( 𝜑 ∧ ( ( 0 −ℝ 𝑡 ) + 𝑟 ) = ( i · ( 𝑢 + ( 0 −ℝ 𝑠 ) ) ) ) → 𝑢 ∈ ℝ ) |
| 53 | 13 | adantr | ⊢ ( ( 𝜑 ∧ ( ( 0 −ℝ 𝑡 ) + 𝑟 ) = ( i · ( 𝑢 + ( 0 −ℝ 𝑠 ) ) ) ) → ( 0 −ℝ 𝑠 ) ∈ ℝ ) |
| 54 | 52 53 | readdcld | ⊢ ( ( 𝜑 ∧ ( ( 0 −ℝ 𝑡 ) + 𝑟 ) = ( i · ( 𝑢 + ( 0 −ℝ 𝑠 ) ) ) ) → ( 𝑢 + ( 0 −ℝ 𝑠 ) ) ∈ ℝ ) |
| 55 | 30 | adantr | ⊢ ( ( 𝜑 ∧ ( ( 0 −ℝ 𝑡 ) + 𝑟 ) = ( i · ( 𝑢 + ( 0 −ℝ 𝑠 ) ) ) ) → ( 0 −ℝ 𝑡 ) ∈ ℝ ) |
| 56 | 1 | adantr | ⊢ ( ( 𝜑 ∧ ( ( 0 −ℝ 𝑡 ) + 𝑟 ) = ( i · ( 𝑢 + ( 0 −ℝ 𝑠 ) ) ) ) → 𝑟 ∈ ℝ ) |
| 57 | 55 56 | readdcld | ⊢ ( ( 𝜑 ∧ ( ( 0 −ℝ 𝑡 ) + 𝑟 ) = ( i · ( 𝑢 + ( 0 −ℝ 𝑠 ) ) ) ) → ( ( 0 −ℝ 𝑡 ) + 𝑟 ) ∈ ℝ ) |
| 58 | 51 57 | eqeltrrd | ⊢ ( ( 𝜑 ∧ ( ( 0 −ℝ 𝑡 ) + 𝑟 ) = ( i · ( 𝑢 + ( 0 −ℝ 𝑠 ) ) ) ) → ( i · ( 𝑢 + ( 0 −ℝ 𝑠 ) ) ) ∈ ℝ ) |
| 59 | sn-itrere | ⊢ ( ( 𝑢 + ( 0 −ℝ 𝑠 ) ) ∈ ℝ → ( ( i · ( 𝑢 + ( 0 −ℝ 𝑠 ) ) ) ∈ ℝ ↔ ( 𝑢 + ( 0 −ℝ 𝑠 ) ) = 0 ) ) | |
| 60 | 59 | biimpa | ⊢ ( ( ( 𝑢 + ( 0 −ℝ 𝑠 ) ) ∈ ℝ ∧ ( i · ( 𝑢 + ( 0 −ℝ 𝑠 ) ) ) ∈ ℝ ) → ( 𝑢 + ( 0 −ℝ 𝑠 ) ) = 0 ) |
| 61 | 54 58 60 | syl2anc | ⊢ ( ( 𝜑 ∧ ( ( 0 −ℝ 𝑡 ) + 𝑟 ) = ( i · ( 𝑢 + ( 0 −ℝ 𝑠 ) ) ) ) → ( 𝑢 + ( 0 −ℝ 𝑠 ) ) = 0 ) |
| 62 | 61 | oveq2d | ⊢ ( ( 𝜑 ∧ ( ( 0 −ℝ 𝑡 ) + 𝑟 ) = ( i · ( 𝑢 + ( 0 −ℝ 𝑠 ) ) ) ) → ( i · ( 𝑢 + ( 0 −ℝ 𝑠 ) ) ) = ( i · 0 ) ) |
| 63 | 21 | a1i | ⊢ ( ( 𝜑 ∧ ( ( 0 −ℝ 𝑡 ) + 𝑟 ) = ( i · ( 𝑢 + ( 0 −ℝ 𝑠 ) ) ) ) → ( i · 0 ) = 0 ) |
| 64 | 51 62 63 | 3eqtrd | ⊢ ( ( 𝜑 ∧ ( ( 0 −ℝ 𝑡 ) + 𝑟 ) = ( i · ( 𝑢 + ( 0 −ℝ 𝑠 ) ) ) ) → ( ( 0 −ℝ 𝑡 ) + 𝑟 ) = 0 ) |
| 65 | oveq2 | ⊢ ( ( ( 0 −ℝ 𝑡 ) + 𝑟 ) = 0 → ( 𝑡 + ( ( 0 −ℝ 𝑡 ) + 𝑟 ) ) = ( 𝑡 + 0 ) ) | |
| 66 | 65 | adantl | ⊢ ( ( 𝜑 ∧ ( ( 0 −ℝ 𝑡 ) + 𝑟 ) = 0 ) → ( 𝑡 + ( ( 0 −ℝ 𝑡 ) + 𝑟 ) ) = ( 𝑡 + 0 ) ) |
| 67 | renegid | ⊢ ( 𝑡 ∈ ℝ → ( 𝑡 + ( 0 −ℝ 𝑡 ) ) = 0 ) | |
| 68 | 3 67 | syl | ⊢ ( 𝜑 → ( 𝑡 + ( 0 −ℝ 𝑡 ) ) = 0 ) |
| 69 | 68 | adantr | ⊢ ( ( 𝜑 ∧ ( ( 0 −ℝ 𝑡 ) + 𝑟 ) = 0 ) → ( 𝑡 + ( 0 −ℝ 𝑡 ) ) = 0 ) |
| 70 | 69 | oveq1d | ⊢ ( ( 𝜑 ∧ ( ( 0 −ℝ 𝑡 ) + 𝑟 ) = 0 ) → ( ( 𝑡 + ( 0 −ℝ 𝑡 ) ) + 𝑟 ) = ( 0 + 𝑟 ) ) |
| 71 | 32 | adantr | ⊢ ( ( 𝜑 ∧ ( ( 0 −ℝ 𝑡 ) + 𝑟 ) = 0 ) → 𝑡 ∈ ℂ ) |
| 72 | 31 | adantr | ⊢ ( ( 𝜑 ∧ ( ( 0 −ℝ 𝑡 ) + 𝑟 ) = 0 ) → ( 0 −ℝ 𝑡 ) ∈ ℂ ) |
| 73 | 7 | adantr | ⊢ ( ( 𝜑 ∧ ( ( 0 −ℝ 𝑡 ) + 𝑟 ) = 0 ) → 𝑟 ∈ ℂ ) |
| 74 | 71 72 73 | addassd | ⊢ ( ( 𝜑 ∧ ( ( 0 −ℝ 𝑡 ) + 𝑟 ) = 0 ) → ( ( 𝑡 + ( 0 −ℝ 𝑡 ) ) + 𝑟 ) = ( 𝑡 + ( ( 0 −ℝ 𝑡 ) + 𝑟 ) ) ) |
| 75 | readdlid | ⊢ ( 𝑟 ∈ ℝ → ( 0 + 𝑟 ) = 𝑟 ) | |
| 76 | 1 75 | syl | ⊢ ( 𝜑 → ( 0 + 𝑟 ) = 𝑟 ) |
| 77 | 76 | adantr | ⊢ ( ( 𝜑 ∧ ( ( 0 −ℝ 𝑡 ) + 𝑟 ) = 0 ) → ( 0 + 𝑟 ) = 𝑟 ) |
| 78 | 70 74 77 | 3eqtr3d | ⊢ ( ( 𝜑 ∧ ( ( 0 −ℝ 𝑡 ) + 𝑟 ) = 0 ) → ( 𝑡 + ( ( 0 −ℝ 𝑡 ) + 𝑟 ) ) = 𝑟 ) |
| 79 | 3 | adantr | ⊢ ( ( 𝜑 ∧ ( ( 0 −ℝ 𝑡 ) + 𝑟 ) = 0 ) → 𝑡 ∈ ℝ ) |
| 80 | readdrid | ⊢ ( 𝑡 ∈ ℝ → ( 𝑡 + 0 ) = 𝑡 ) | |
| 81 | 79 80 | syl | ⊢ ( ( 𝜑 ∧ ( ( 0 −ℝ 𝑡 ) + 𝑟 ) = 0 ) → ( 𝑡 + 0 ) = 𝑡 ) |
| 82 | 66 78 81 | 3eqtr3d | ⊢ ( ( 𝜑 ∧ ( ( 0 −ℝ 𝑡 ) + 𝑟 ) = 0 ) → 𝑟 = 𝑡 ) |
| 83 | 64 82 | syldan | ⊢ ( ( 𝜑 ∧ ( ( 0 −ℝ 𝑡 ) + 𝑟 ) = ( i · ( 𝑢 + ( 0 −ℝ 𝑠 ) ) ) ) → 𝑟 = 𝑡 ) |
| 84 | 33 14 10 | addassd | ⊢ ( 𝜑 → ( ( 𝑢 + ( 0 −ℝ 𝑠 ) ) + 𝑠 ) = ( 𝑢 + ( ( 0 −ℝ 𝑠 ) + 𝑠 ) ) ) |
| 85 | renegid2 | ⊢ ( 𝑠 ∈ ℝ → ( ( 0 −ℝ 𝑠 ) + 𝑠 ) = 0 ) | |
| 86 | 2 85 | syl | ⊢ ( 𝜑 → ( ( 0 −ℝ 𝑠 ) + 𝑠 ) = 0 ) |
| 87 | 86 | oveq2d | ⊢ ( 𝜑 → ( 𝑢 + ( ( 0 −ℝ 𝑠 ) + 𝑠 ) ) = ( 𝑢 + 0 ) ) |
| 88 | readdrid | ⊢ ( 𝑢 ∈ ℝ → ( 𝑢 + 0 ) = 𝑢 ) | |
| 89 | 4 88 | syl | ⊢ ( 𝜑 → ( 𝑢 + 0 ) = 𝑢 ) |
| 90 | 84 87 89 | 3eqtrd | ⊢ ( 𝜑 → ( ( 𝑢 + ( 0 −ℝ 𝑠 ) ) + 𝑠 ) = 𝑢 ) |
| 91 | oveq1 | ⊢ ( ( 𝑢 + ( 0 −ℝ 𝑠 ) ) = 0 → ( ( 𝑢 + ( 0 −ℝ 𝑠 ) ) + 𝑠 ) = ( 0 + 𝑠 ) ) | |
| 92 | 90 91 | sylan9req | ⊢ ( ( 𝜑 ∧ ( 𝑢 + ( 0 −ℝ 𝑠 ) ) = 0 ) → 𝑢 = ( 0 + 𝑠 ) ) |
| 93 | readdlid | ⊢ ( 𝑠 ∈ ℝ → ( 0 + 𝑠 ) = 𝑠 ) | |
| 94 | 2 93 | syl | ⊢ ( 𝜑 → ( 0 + 𝑠 ) = 𝑠 ) |
| 95 | 94 | adantr | ⊢ ( ( 𝜑 ∧ ( 𝑢 + ( 0 −ℝ 𝑠 ) ) = 0 ) → ( 0 + 𝑠 ) = 𝑠 ) |
| 96 | 92 95 | eqtr2d | ⊢ ( ( 𝜑 ∧ ( 𝑢 + ( 0 −ℝ 𝑠 ) ) = 0 ) → 𝑠 = 𝑢 ) |
| 97 | 61 96 | syldan | ⊢ ( ( 𝜑 ∧ ( ( 0 −ℝ 𝑡 ) + 𝑟 ) = ( i · ( 𝑢 + ( 0 −ℝ 𝑠 ) ) ) ) → 𝑠 = 𝑢 ) |
| 98 | 83 97 | jca | ⊢ ( ( 𝜑 ∧ ( ( 0 −ℝ 𝑡 ) + 𝑟 ) = ( i · ( 𝑢 + ( 0 −ℝ 𝑠 ) ) ) ) → ( 𝑟 = 𝑡 ∧ 𝑠 = 𝑢 ) ) |
| 99 | 50 98 | syldan | ⊢ ( ( 𝜑 ∧ ( ( 0 −ℝ 𝑡 ) + ( ( 𝑟 + ( i · 𝑠 ) ) + ( i · ( 0 −ℝ 𝑠 ) ) ) ) = ( ( 0 −ℝ 𝑡 ) + ( ( 𝑡 + ( i · 𝑢 ) ) + ( i · ( 0 −ℝ 𝑠 ) ) ) ) ) → ( 𝑟 = 𝑡 ∧ 𝑠 = 𝑢 ) ) |
| 100 | 99 | ex | ⊢ ( 𝜑 → ( ( ( 0 −ℝ 𝑡 ) + ( ( 𝑟 + ( i · 𝑠 ) ) + ( i · ( 0 −ℝ 𝑠 ) ) ) ) = ( ( 0 −ℝ 𝑡 ) + ( ( 𝑡 + ( i · 𝑢 ) ) + ( i · ( 0 −ℝ 𝑠 ) ) ) ) → ( 𝑟 = 𝑡 ∧ 𝑠 = 𝑢 ) ) ) |
| 101 | 6 100 | syl5 | ⊢ ( 𝜑 → ( ( 𝑟 + ( i · 𝑠 ) ) = ( 𝑡 + ( i · 𝑢 ) ) → ( 𝑟 = 𝑡 ∧ 𝑠 = 𝑢 ) ) ) |
| 102 | id | ⊢ ( 𝑟 = 𝑡 → 𝑟 = 𝑡 ) | |
| 103 | oveq2 | ⊢ ( 𝑠 = 𝑢 → ( i · 𝑠 ) = ( i · 𝑢 ) ) | |
| 104 | 102 103 | oveqan12d | ⊢ ( ( 𝑟 = 𝑡 ∧ 𝑠 = 𝑢 ) → ( 𝑟 + ( i · 𝑠 ) ) = ( 𝑡 + ( i · 𝑢 ) ) ) |
| 105 | 101 104 | impbid1 | ⊢ ( 𝜑 → ( ( 𝑟 + ( i · 𝑠 ) ) = ( 𝑡 + ( i · 𝑢 ) ) ↔ ( 𝑟 = 𝑡 ∧ 𝑠 = 𝑢 ) ) ) |