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Description: Lemma for resubeu . A value which when added to A , results in B . (Contributed by Steven Nguyen, 7-Jan-2023)
| Ref | Expression | ||
|---|---|---|---|
| Assertion | resubeulem2 | ⊢ ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ) → ( 𝐴 + ( ( 0 −ℝ 𝐴 ) + ( ( 0 −ℝ ( 0 + 0 ) ) + 𝐵 ) ) ) = 𝐵 ) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | renegid | ⊢ ( 𝐴 ∈ ℝ → ( 𝐴 + ( 0 −ℝ 𝐴 ) ) = 0 ) | |
| 2 | 1 | adantr | ⊢ ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ) → ( 𝐴 + ( 0 −ℝ 𝐴 ) ) = 0 ) |
| 3 | 2 | oveq1d | ⊢ ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ) → ( ( 𝐴 + ( 0 −ℝ 𝐴 ) ) + ( ( 0 −ℝ ( 0 + 0 ) ) + 𝐵 ) ) = ( 0 + ( ( 0 −ℝ ( 0 + 0 ) ) + 𝐵 ) ) ) |
| 4 | simpl | ⊢ ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ) → 𝐴 ∈ ℝ ) | |
| 5 | 4 | recnd | ⊢ ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ) → 𝐴 ∈ ℂ ) |
| 6 | rernegcl | ⊢ ( 𝐴 ∈ ℝ → ( 0 −ℝ 𝐴 ) ∈ ℝ ) | |
| 7 | 6 | adantr | ⊢ ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ) → ( 0 −ℝ 𝐴 ) ∈ ℝ ) |
| 8 | 7 | recnd | ⊢ ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ) → ( 0 −ℝ 𝐴 ) ∈ ℂ ) |
| 9 | elre0re | ⊢ ( 𝐵 ∈ ℝ → 0 ∈ ℝ ) | |
| 10 | 9 9 | readdcld | ⊢ ( 𝐵 ∈ ℝ → ( 0 + 0 ) ∈ ℝ ) |
| 11 | rernegcl | ⊢ ( ( 0 + 0 ) ∈ ℝ → ( 0 −ℝ ( 0 + 0 ) ) ∈ ℝ ) | |
| 12 | 10 11 | syl | ⊢ ( 𝐵 ∈ ℝ → ( 0 −ℝ ( 0 + 0 ) ) ∈ ℝ ) |
| 13 | id | ⊢ ( 𝐵 ∈ ℝ → 𝐵 ∈ ℝ ) | |
| 14 | 12 13 | readdcld | ⊢ ( 𝐵 ∈ ℝ → ( ( 0 −ℝ ( 0 + 0 ) ) + 𝐵 ) ∈ ℝ ) |
| 15 | 14 | adantl | ⊢ ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ) → ( ( 0 −ℝ ( 0 + 0 ) ) + 𝐵 ) ∈ ℝ ) |
| 16 | 15 | recnd | ⊢ ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ) → ( ( 0 −ℝ ( 0 + 0 ) ) + 𝐵 ) ∈ ℂ ) |
| 17 | 5 8 16 | addassd | ⊢ ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ) → ( ( 𝐴 + ( 0 −ℝ 𝐴 ) ) + ( ( 0 −ℝ ( 0 + 0 ) ) + 𝐵 ) ) = ( 𝐴 + ( ( 0 −ℝ 𝐴 ) + ( ( 0 −ℝ ( 0 + 0 ) ) + 𝐵 ) ) ) ) |
| 18 | resubeulem1 | ⊢ ( 𝐵 ∈ ℝ → ( 0 + ( 0 −ℝ ( 0 + 0 ) ) ) = ( 0 −ℝ 0 ) ) | |
| 19 | 18 | oveq1d | ⊢ ( 𝐵 ∈ ℝ → ( ( 0 + ( 0 −ℝ ( 0 + 0 ) ) ) + 𝐵 ) = ( ( 0 −ℝ 0 ) + 𝐵 ) ) |
| 20 | 9 | recnd | ⊢ ( 𝐵 ∈ ℝ → 0 ∈ ℂ ) |
| 21 | 12 | recnd | ⊢ ( 𝐵 ∈ ℝ → ( 0 −ℝ ( 0 + 0 ) ) ∈ ℂ ) |
| 22 | recn | ⊢ ( 𝐵 ∈ ℝ → 𝐵 ∈ ℂ ) | |
| 23 | 20 21 22 | addassd | ⊢ ( 𝐵 ∈ ℝ → ( ( 0 + ( 0 −ℝ ( 0 + 0 ) ) ) + 𝐵 ) = ( 0 + ( ( 0 −ℝ ( 0 + 0 ) ) + 𝐵 ) ) ) |
| 24 | reneg0addlid | ⊢ ( 𝐵 ∈ ℝ → ( ( 0 −ℝ 0 ) + 𝐵 ) = 𝐵 ) | |
| 25 | 19 23 24 | 3eqtr3d | ⊢ ( 𝐵 ∈ ℝ → ( 0 + ( ( 0 −ℝ ( 0 + 0 ) ) + 𝐵 ) ) = 𝐵 ) |
| 26 | 25 | adantl | ⊢ ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ) → ( 0 + ( ( 0 −ℝ ( 0 + 0 ) ) + 𝐵 ) ) = 𝐵 ) |
| 27 | 3 17 26 | 3eqtr3d | ⊢ ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ) → ( 𝐴 + ( ( 0 −ℝ 𝐴 ) + ( ( 0 −ℝ ( 0 + 0 ) ) + 𝐵 ) ) ) = 𝐵 ) |