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Description: Commuted version of readdcan without ax-mulcom . (Contributed by SN, 21-Feb-2024)
| Ref | Expression | ||
|---|---|---|---|
| Assertion | readdcan2 | ⊢ ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 𝐶 ∈ ℝ ) → ( ( 𝐴 + 𝐶 ) = ( 𝐵 + 𝐶 ) ↔ 𝐴 = 𝐵 ) ) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | oveq1 | ⊢ ( ( 𝐴 + 𝐶 ) = ( 𝐵 + 𝐶 ) → ( ( 𝐴 + 𝐶 ) + ( 0 −ℝ 𝐶 ) ) = ( ( 𝐵 + 𝐶 ) + ( 0 −ℝ 𝐶 ) ) ) | |
| 2 | 1 | adantl | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 𝐶 ∈ ℝ ) ∧ ( 𝐴 + 𝐶 ) = ( 𝐵 + 𝐶 ) ) → ( ( 𝐴 + 𝐶 ) + ( 0 −ℝ 𝐶 ) ) = ( ( 𝐵 + 𝐶 ) + ( 0 −ℝ 𝐶 ) ) ) |
| 3 | simpl | ⊢ ( ( 𝐴 ∈ ℝ ∧ 𝐶 ∈ ℝ ) → 𝐴 ∈ ℝ ) | |
| 4 | 3 | recnd | ⊢ ( ( 𝐴 ∈ ℝ ∧ 𝐶 ∈ ℝ ) → 𝐴 ∈ ℂ ) |
| 5 | simpr | ⊢ ( ( 𝐴 ∈ ℝ ∧ 𝐶 ∈ ℝ ) → 𝐶 ∈ ℝ ) | |
| 6 | 5 | recnd | ⊢ ( ( 𝐴 ∈ ℝ ∧ 𝐶 ∈ ℝ ) → 𝐶 ∈ ℂ ) |
| 7 | rernegcl | ⊢ ( 𝐶 ∈ ℝ → ( 0 −ℝ 𝐶 ) ∈ ℝ ) | |
| 8 | 7 | adantl | ⊢ ( ( 𝐴 ∈ ℝ ∧ 𝐶 ∈ ℝ ) → ( 0 −ℝ 𝐶 ) ∈ ℝ ) |
| 9 | 8 | recnd | ⊢ ( ( 𝐴 ∈ ℝ ∧ 𝐶 ∈ ℝ ) → ( 0 −ℝ 𝐶 ) ∈ ℂ ) |
| 10 | 4 6 9 | addassd | ⊢ ( ( 𝐴 ∈ ℝ ∧ 𝐶 ∈ ℝ ) → ( ( 𝐴 + 𝐶 ) + ( 0 −ℝ 𝐶 ) ) = ( 𝐴 + ( 𝐶 + ( 0 −ℝ 𝐶 ) ) ) ) |
| 11 | renegid | ⊢ ( 𝐶 ∈ ℝ → ( 𝐶 + ( 0 −ℝ 𝐶 ) ) = 0 ) | |
| 12 | 11 | oveq2d | ⊢ ( 𝐶 ∈ ℝ → ( 𝐴 + ( 𝐶 + ( 0 −ℝ 𝐶 ) ) ) = ( 𝐴 + 0 ) ) |
| 13 | 12 | adantl | ⊢ ( ( 𝐴 ∈ ℝ ∧ 𝐶 ∈ ℝ ) → ( 𝐴 + ( 𝐶 + ( 0 −ℝ 𝐶 ) ) ) = ( 𝐴 + 0 ) ) |
| 14 | readdrid | ⊢ ( 𝐴 ∈ ℝ → ( 𝐴 + 0 ) = 𝐴 ) | |
| 15 | 14 | adantr | ⊢ ( ( 𝐴 ∈ ℝ ∧ 𝐶 ∈ ℝ ) → ( 𝐴 + 0 ) = 𝐴 ) |
| 16 | 10 13 15 | 3eqtrd | ⊢ ( ( 𝐴 ∈ ℝ ∧ 𝐶 ∈ ℝ ) → ( ( 𝐴 + 𝐶 ) + ( 0 −ℝ 𝐶 ) ) = 𝐴 ) |
| 17 | 16 | 3adant2 | ⊢ ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 𝐶 ∈ ℝ ) → ( ( 𝐴 + 𝐶 ) + ( 0 −ℝ 𝐶 ) ) = 𝐴 ) |
| 18 | 17 | adantr | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 𝐶 ∈ ℝ ) ∧ ( 𝐴 + 𝐶 ) = ( 𝐵 + 𝐶 ) ) → ( ( 𝐴 + 𝐶 ) + ( 0 −ℝ 𝐶 ) ) = 𝐴 ) |
| 19 | simpl | ⊢ ( ( 𝐵 ∈ ℝ ∧ 𝐶 ∈ ℝ ) → 𝐵 ∈ ℝ ) | |
| 20 | 19 | recnd | ⊢ ( ( 𝐵 ∈ ℝ ∧ 𝐶 ∈ ℝ ) → 𝐵 ∈ ℂ ) |
| 21 | simpr | ⊢ ( ( 𝐵 ∈ ℝ ∧ 𝐶 ∈ ℝ ) → 𝐶 ∈ ℝ ) | |
| 22 | 21 | recnd | ⊢ ( ( 𝐵 ∈ ℝ ∧ 𝐶 ∈ ℝ ) → 𝐶 ∈ ℂ ) |
| 23 | 7 | adantl | ⊢ ( ( 𝐵 ∈ ℝ ∧ 𝐶 ∈ ℝ ) → ( 0 −ℝ 𝐶 ) ∈ ℝ ) |
| 24 | 23 | recnd | ⊢ ( ( 𝐵 ∈ ℝ ∧ 𝐶 ∈ ℝ ) → ( 0 −ℝ 𝐶 ) ∈ ℂ ) |
| 25 | 20 22 24 | addassd | ⊢ ( ( 𝐵 ∈ ℝ ∧ 𝐶 ∈ ℝ ) → ( ( 𝐵 + 𝐶 ) + ( 0 −ℝ 𝐶 ) ) = ( 𝐵 + ( 𝐶 + ( 0 −ℝ 𝐶 ) ) ) ) |
| 26 | 11 | oveq2d | ⊢ ( 𝐶 ∈ ℝ → ( 𝐵 + ( 𝐶 + ( 0 −ℝ 𝐶 ) ) ) = ( 𝐵 + 0 ) ) |
| 27 | 26 | adantl | ⊢ ( ( 𝐵 ∈ ℝ ∧ 𝐶 ∈ ℝ ) → ( 𝐵 + ( 𝐶 + ( 0 −ℝ 𝐶 ) ) ) = ( 𝐵 + 0 ) ) |
| 28 | readdrid | ⊢ ( 𝐵 ∈ ℝ → ( 𝐵 + 0 ) = 𝐵 ) | |
| 29 | 28 | adantr | ⊢ ( ( 𝐵 ∈ ℝ ∧ 𝐶 ∈ ℝ ) → ( 𝐵 + 0 ) = 𝐵 ) |
| 30 | 25 27 29 | 3eqtrd | ⊢ ( ( 𝐵 ∈ ℝ ∧ 𝐶 ∈ ℝ ) → ( ( 𝐵 + 𝐶 ) + ( 0 −ℝ 𝐶 ) ) = 𝐵 ) |
| 31 | 30 | 3adant1 | ⊢ ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 𝐶 ∈ ℝ ) → ( ( 𝐵 + 𝐶 ) + ( 0 −ℝ 𝐶 ) ) = 𝐵 ) |
| 32 | 31 | adantr | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 𝐶 ∈ ℝ ) ∧ ( 𝐴 + 𝐶 ) = ( 𝐵 + 𝐶 ) ) → ( ( 𝐵 + 𝐶 ) + ( 0 −ℝ 𝐶 ) ) = 𝐵 ) |
| 33 | 2 18 32 | 3eqtr3d | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 𝐶 ∈ ℝ ) ∧ ( 𝐴 + 𝐶 ) = ( 𝐵 + 𝐶 ) ) → 𝐴 = 𝐵 ) |
| 34 | 33 | ex | ⊢ ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 𝐶 ∈ ℝ ) → ( ( 𝐴 + 𝐶 ) = ( 𝐵 + 𝐶 ) → 𝐴 = 𝐵 ) ) |
| 35 | oveq1 | ⊢ ( 𝐴 = 𝐵 → ( 𝐴 + 𝐶 ) = ( 𝐵 + 𝐶 ) ) | |
| 36 | 34 35 | impbid1 | ⊢ ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 𝐶 ∈ ℝ ) → ( ( 𝐴 + 𝐶 ) = ( 𝐵 + 𝐶 ) ↔ 𝐴 = 𝐵 ) ) |