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Description: A combination of cnegex and cnegex2 , this proof takes cnre A = r +i x. s and shows that i x. -u s + -u r is both a left and right inverse. (Contributed by SN, 5-May-2024) (Proof shortened by SN, 4-Jul-2025)
| Ref | Expression | ||
|---|---|---|---|
| Assertion | sn-negex12 | ⊢ ( 𝐴 ∈ ℂ → ∃ 𝑏 ∈ ℂ ( ( 𝐴 + 𝑏 ) = 0 ∧ ( 𝑏 + 𝐴 ) = 0 ) ) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | cnre | ⊢ ( 𝐴 ∈ ℂ → ∃ 𝑥 ∈ ℝ ∃ 𝑦 ∈ ℝ 𝐴 = ( 𝑥 + ( i · 𝑦 ) ) ) | |
| 2 | oveq2 | ⊢ ( 𝑏 = ( ( i · ( 0 −ℝ 𝑦 ) ) + ( 0 −ℝ 𝑥 ) ) → ( ( 𝑥 + ( i · 𝑦 ) ) + 𝑏 ) = ( ( 𝑥 + ( i · 𝑦 ) ) + ( ( i · ( 0 −ℝ 𝑦 ) ) + ( 0 −ℝ 𝑥 ) ) ) ) | |
| 3 | 2 | eqeq1d | ⊢ ( 𝑏 = ( ( i · ( 0 −ℝ 𝑦 ) ) + ( 0 −ℝ 𝑥 ) ) → ( ( ( 𝑥 + ( i · 𝑦 ) ) + 𝑏 ) = 0 ↔ ( ( 𝑥 + ( i · 𝑦 ) ) + ( ( i · ( 0 −ℝ 𝑦 ) ) + ( 0 −ℝ 𝑥 ) ) ) = 0 ) ) |
| 4 | oveq1 | ⊢ ( 𝑏 = ( ( i · ( 0 −ℝ 𝑦 ) ) + ( 0 −ℝ 𝑥 ) ) → ( 𝑏 + ( 𝑥 + ( i · 𝑦 ) ) ) = ( ( ( i · ( 0 −ℝ 𝑦 ) ) + ( 0 −ℝ 𝑥 ) ) + ( 𝑥 + ( i · 𝑦 ) ) ) ) | |
| 5 | 4 | eqeq1d | ⊢ ( 𝑏 = ( ( i · ( 0 −ℝ 𝑦 ) ) + ( 0 −ℝ 𝑥 ) ) → ( ( 𝑏 + ( 𝑥 + ( i · 𝑦 ) ) ) = 0 ↔ ( ( ( i · ( 0 −ℝ 𝑦 ) ) + ( 0 −ℝ 𝑥 ) ) + ( 𝑥 + ( i · 𝑦 ) ) ) = 0 ) ) |
| 6 | 3 5 | anbi12d | ⊢ ( 𝑏 = ( ( i · ( 0 −ℝ 𝑦 ) ) + ( 0 −ℝ 𝑥 ) ) → ( ( ( ( 𝑥 + ( i · 𝑦 ) ) + 𝑏 ) = 0 ∧ ( 𝑏 + ( 𝑥 + ( i · 𝑦 ) ) ) = 0 ) ↔ ( ( ( 𝑥 + ( i · 𝑦 ) ) + ( ( i · ( 0 −ℝ 𝑦 ) ) + ( 0 −ℝ 𝑥 ) ) ) = 0 ∧ ( ( ( i · ( 0 −ℝ 𝑦 ) ) + ( 0 −ℝ 𝑥 ) ) + ( 𝑥 + ( i · 𝑦 ) ) ) = 0 ) ) ) |
| 7 | ax-icn | ⊢ i ∈ ℂ | |
| 8 | 7 | a1i | ⊢ ( 𝑦 ∈ ℝ → i ∈ ℂ ) |
| 9 | rernegcl | ⊢ ( 𝑦 ∈ ℝ → ( 0 −ℝ 𝑦 ) ∈ ℝ ) | |
| 10 | 9 | recnd | ⊢ ( 𝑦 ∈ ℝ → ( 0 −ℝ 𝑦 ) ∈ ℂ ) |
| 11 | 8 10 | mulcld | ⊢ ( 𝑦 ∈ ℝ → ( i · ( 0 −ℝ 𝑦 ) ) ∈ ℂ ) |
| 12 | 11 | adantl | ⊢ ( ( 𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ ) → ( i · ( 0 −ℝ 𝑦 ) ) ∈ ℂ ) |
| 13 | rernegcl | ⊢ ( 𝑥 ∈ ℝ → ( 0 −ℝ 𝑥 ) ∈ ℝ ) | |
| 14 | 13 | recnd | ⊢ ( 𝑥 ∈ ℝ → ( 0 −ℝ 𝑥 ) ∈ ℂ ) |
| 15 | 14 | adantr | ⊢ ( ( 𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ ) → ( 0 −ℝ 𝑥 ) ∈ ℂ ) |
| 16 | 12 15 | addcld | ⊢ ( ( 𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ ) → ( ( i · ( 0 −ℝ 𝑦 ) ) + ( 0 −ℝ 𝑥 ) ) ∈ ℂ ) |
| 17 | recn | ⊢ ( 𝑥 ∈ ℝ → 𝑥 ∈ ℂ ) | |
| 18 | 17 | adantr | ⊢ ( ( 𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ ) → 𝑥 ∈ ℂ ) |
| 19 | recn | ⊢ ( 𝑦 ∈ ℝ → 𝑦 ∈ ℂ ) | |
| 20 | 8 19 | mulcld | ⊢ ( 𝑦 ∈ ℝ → ( i · 𝑦 ) ∈ ℂ ) |
| 21 | 20 | adantl | ⊢ ( ( 𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ ) → ( i · 𝑦 ) ∈ ℂ ) |
| 22 | 18 21 12 | addassd | ⊢ ( ( 𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ ) → ( ( 𝑥 + ( i · 𝑦 ) ) + ( i · ( 0 −ℝ 𝑦 ) ) ) = ( 𝑥 + ( ( i · 𝑦 ) + ( i · ( 0 −ℝ 𝑦 ) ) ) ) ) |
| 23 | 8 19 10 | adddid | ⊢ ( 𝑦 ∈ ℝ → ( i · ( 𝑦 + ( 0 −ℝ 𝑦 ) ) ) = ( ( i · 𝑦 ) + ( i · ( 0 −ℝ 𝑦 ) ) ) ) |
| 24 | renegid | ⊢ ( 𝑦 ∈ ℝ → ( 𝑦 + ( 0 −ℝ 𝑦 ) ) = 0 ) | |
| 25 | 24 | oveq2d | ⊢ ( 𝑦 ∈ ℝ → ( i · ( 𝑦 + ( 0 −ℝ 𝑦 ) ) ) = ( i · 0 ) ) |
| 26 | sn-it0e0 | ⊢ ( i · 0 ) = 0 | |
| 27 | 25 26 | eqtrdi | ⊢ ( 𝑦 ∈ ℝ → ( i · ( 𝑦 + ( 0 −ℝ 𝑦 ) ) ) = 0 ) |
| 28 | 23 27 | eqtr3d | ⊢ ( 𝑦 ∈ ℝ → ( ( i · 𝑦 ) + ( i · ( 0 −ℝ 𝑦 ) ) ) = 0 ) |
| 29 | 28 | adantl | ⊢ ( ( 𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ ) → ( ( i · 𝑦 ) + ( i · ( 0 −ℝ 𝑦 ) ) ) = 0 ) |
| 30 | 29 | oveq2d | ⊢ ( ( 𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ ) → ( 𝑥 + ( ( i · 𝑦 ) + ( i · ( 0 −ℝ 𝑦 ) ) ) ) = ( 𝑥 + 0 ) ) |
| 31 | readdrid | ⊢ ( 𝑥 ∈ ℝ → ( 𝑥 + 0 ) = 𝑥 ) | |
| 32 | 31 | adantr | ⊢ ( ( 𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ ) → ( 𝑥 + 0 ) = 𝑥 ) |
| 33 | 22 30 32 | 3eqtrd | ⊢ ( ( 𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ ) → ( ( 𝑥 + ( i · 𝑦 ) ) + ( i · ( 0 −ℝ 𝑦 ) ) ) = 𝑥 ) |
| 34 | 33 | oveq1d | ⊢ ( ( 𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ ) → ( ( ( 𝑥 + ( i · 𝑦 ) ) + ( i · ( 0 −ℝ 𝑦 ) ) ) + ( 0 −ℝ 𝑥 ) ) = ( 𝑥 + ( 0 −ℝ 𝑥 ) ) ) |
| 35 | 18 21 | addcld | ⊢ ( ( 𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ ) → ( 𝑥 + ( i · 𝑦 ) ) ∈ ℂ ) |
| 36 | 35 12 15 | addassd | ⊢ ( ( 𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ ) → ( ( ( 𝑥 + ( i · 𝑦 ) ) + ( i · ( 0 −ℝ 𝑦 ) ) ) + ( 0 −ℝ 𝑥 ) ) = ( ( 𝑥 + ( i · 𝑦 ) ) + ( ( i · ( 0 −ℝ 𝑦 ) ) + ( 0 −ℝ 𝑥 ) ) ) ) |
| 37 | renegid | ⊢ ( 𝑥 ∈ ℝ → ( 𝑥 + ( 0 −ℝ 𝑥 ) ) = 0 ) | |
| 38 | 37 | adantr | ⊢ ( ( 𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ ) → ( 𝑥 + ( 0 −ℝ 𝑥 ) ) = 0 ) |
| 39 | 34 36 38 | 3eqtr3d | ⊢ ( ( 𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ ) → ( ( 𝑥 + ( i · 𝑦 ) ) + ( ( i · ( 0 −ℝ 𝑦 ) ) + ( 0 −ℝ 𝑥 ) ) ) = 0 ) |
| 40 | 12 15 35 | addassd | ⊢ ( ( 𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ ) → ( ( ( i · ( 0 −ℝ 𝑦 ) ) + ( 0 −ℝ 𝑥 ) ) + ( 𝑥 + ( i · 𝑦 ) ) ) = ( ( i · ( 0 −ℝ 𝑦 ) ) + ( ( 0 −ℝ 𝑥 ) + ( 𝑥 + ( i · 𝑦 ) ) ) ) ) |
| 41 | renegid2 | ⊢ ( 𝑥 ∈ ℝ → ( ( 0 −ℝ 𝑥 ) + 𝑥 ) = 0 ) | |
| 42 | 41 | adantr | ⊢ ( ( 𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ ) → ( ( 0 −ℝ 𝑥 ) + 𝑥 ) = 0 ) |
| 43 | 42 | oveq1d | ⊢ ( ( 𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ ) → ( ( ( 0 −ℝ 𝑥 ) + 𝑥 ) + ( i · 𝑦 ) ) = ( 0 + ( i · 𝑦 ) ) ) |
| 44 | 15 18 21 | addassd | ⊢ ( ( 𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ ) → ( ( ( 0 −ℝ 𝑥 ) + 𝑥 ) + ( i · 𝑦 ) ) = ( ( 0 −ℝ 𝑥 ) + ( 𝑥 + ( i · 𝑦 ) ) ) ) |
| 45 | sn-addlid | ⊢ ( ( i · 𝑦 ) ∈ ℂ → ( 0 + ( i · 𝑦 ) ) = ( i · 𝑦 ) ) | |
| 46 | 21 45 | syl | ⊢ ( ( 𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ ) → ( 0 + ( i · 𝑦 ) ) = ( i · 𝑦 ) ) |
| 47 | 43 44 46 | 3eqtr3rd | ⊢ ( ( 𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ ) → ( i · 𝑦 ) = ( ( 0 −ℝ 𝑥 ) + ( 𝑥 + ( i · 𝑦 ) ) ) ) |
| 48 | 47 | oveq2d | ⊢ ( ( 𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ ) → ( ( i · ( 0 −ℝ 𝑦 ) ) + ( i · 𝑦 ) ) = ( ( i · ( 0 −ℝ 𝑦 ) ) + ( ( 0 −ℝ 𝑥 ) + ( 𝑥 + ( i · 𝑦 ) ) ) ) ) |
| 49 | 8 10 19 | adddid | ⊢ ( 𝑦 ∈ ℝ → ( i · ( ( 0 −ℝ 𝑦 ) + 𝑦 ) ) = ( ( i · ( 0 −ℝ 𝑦 ) ) + ( i · 𝑦 ) ) ) |
| 50 | renegid2 | ⊢ ( 𝑦 ∈ ℝ → ( ( 0 −ℝ 𝑦 ) + 𝑦 ) = 0 ) | |
| 51 | 50 | oveq2d | ⊢ ( 𝑦 ∈ ℝ → ( i · ( ( 0 −ℝ 𝑦 ) + 𝑦 ) ) = ( i · 0 ) ) |
| 52 | 51 26 | eqtrdi | ⊢ ( 𝑦 ∈ ℝ → ( i · ( ( 0 −ℝ 𝑦 ) + 𝑦 ) ) = 0 ) |
| 53 | 49 52 | eqtr3d | ⊢ ( 𝑦 ∈ ℝ → ( ( i · ( 0 −ℝ 𝑦 ) ) + ( i · 𝑦 ) ) = 0 ) |
| 54 | 53 | adantl | ⊢ ( ( 𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ ) → ( ( i · ( 0 −ℝ 𝑦 ) ) + ( i · 𝑦 ) ) = 0 ) |
| 55 | 40 48 54 | 3eqtr2d | ⊢ ( ( 𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ ) → ( ( ( i · ( 0 −ℝ 𝑦 ) ) + ( 0 −ℝ 𝑥 ) ) + ( 𝑥 + ( i · 𝑦 ) ) ) = 0 ) |
| 56 | 39 55 | jca | ⊢ ( ( 𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ ) → ( ( ( 𝑥 + ( i · 𝑦 ) ) + ( ( i · ( 0 −ℝ 𝑦 ) ) + ( 0 −ℝ 𝑥 ) ) ) = 0 ∧ ( ( ( i · ( 0 −ℝ 𝑦 ) ) + ( 0 −ℝ 𝑥 ) ) + ( 𝑥 + ( i · 𝑦 ) ) ) = 0 ) ) |
| 57 | 6 16 56 | rspcedvdw | ⊢ ( ( 𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ ) → ∃ 𝑏 ∈ ℂ ( ( ( 𝑥 + ( i · 𝑦 ) ) + 𝑏 ) = 0 ∧ ( 𝑏 + ( 𝑥 + ( i · 𝑦 ) ) ) = 0 ) ) |
| 58 | 57 | adantl | ⊢ ( ( 𝐴 ∈ ℂ ∧ ( 𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ ) ) → ∃ 𝑏 ∈ ℂ ( ( ( 𝑥 + ( i · 𝑦 ) ) + 𝑏 ) = 0 ∧ ( 𝑏 + ( 𝑥 + ( i · 𝑦 ) ) ) = 0 ) ) |
| 59 | oveq1 | ⊢ ( 𝐴 = ( 𝑥 + ( i · 𝑦 ) ) → ( 𝐴 + 𝑏 ) = ( ( 𝑥 + ( i · 𝑦 ) ) + 𝑏 ) ) | |
| 60 | 59 | eqeq1d | ⊢ ( 𝐴 = ( 𝑥 + ( i · 𝑦 ) ) → ( ( 𝐴 + 𝑏 ) = 0 ↔ ( ( 𝑥 + ( i · 𝑦 ) ) + 𝑏 ) = 0 ) ) |
| 61 | oveq2 | ⊢ ( 𝐴 = ( 𝑥 + ( i · 𝑦 ) ) → ( 𝑏 + 𝐴 ) = ( 𝑏 + ( 𝑥 + ( i · 𝑦 ) ) ) ) | |
| 62 | 61 | eqeq1d | ⊢ ( 𝐴 = ( 𝑥 + ( i · 𝑦 ) ) → ( ( 𝑏 + 𝐴 ) = 0 ↔ ( 𝑏 + ( 𝑥 + ( i · 𝑦 ) ) ) = 0 ) ) |
| 63 | 60 62 | anbi12d | ⊢ ( 𝐴 = ( 𝑥 + ( i · 𝑦 ) ) → ( ( ( 𝐴 + 𝑏 ) = 0 ∧ ( 𝑏 + 𝐴 ) = 0 ) ↔ ( ( ( 𝑥 + ( i · 𝑦 ) ) + 𝑏 ) = 0 ∧ ( 𝑏 + ( 𝑥 + ( i · 𝑦 ) ) ) = 0 ) ) ) |
| 64 | 63 | rexbidv | ⊢ ( 𝐴 = ( 𝑥 + ( i · 𝑦 ) ) → ( ∃ 𝑏 ∈ ℂ ( ( 𝐴 + 𝑏 ) = 0 ∧ ( 𝑏 + 𝐴 ) = 0 ) ↔ ∃ 𝑏 ∈ ℂ ( ( ( 𝑥 + ( i · 𝑦 ) ) + 𝑏 ) = 0 ∧ ( 𝑏 + ( 𝑥 + ( i · 𝑦 ) ) ) = 0 ) ) ) |
| 65 | 58 64 | syl5ibrcom | ⊢ ( ( 𝐴 ∈ ℂ ∧ ( 𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ ) ) → ( 𝐴 = ( 𝑥 + ( i · 𝑦 ) ) → ∃ 𝑏 ∈ ℂ ( ( 𝐴 + 𝑏 ) = 0 ∧ ( 𝑏 + 𝐴 ) = 0 ) ) ) |
| 66 | 65 | rexlimdvva | ⊢ ( 𝐴 ∈ ℂ → ( ∃ 𝑥 ∈ ℝ ∃ 𝑦 ∈ ℝ 𝐴 = ( 𝑥 + ( i · 𝑦 ) ) → ∃ 𝑏 ∈ ℂ ( ( 𝐴 + 𝑏 ) = 0 ∧ ( 𝑏 + 𝐴 ) = 0 ) ) ) |
| 67 | 1 66 | mpd | ⊢ ( 𝐴 ∈ ℂ → ∃ 𝑏 ∈ ℂ ( ( 𝐴 + 𝑏 ) = 0 ∧ ( 𝑏 + 𝐴 ) = 0 ) ) |