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Description: Lemma for sn-00id . (Contributed by SN, 25-Dec-2023)
| Ref | Expression | ||
|---|---|---|---|
| Assertion | sn-00idlem2 | ⊢ ( ( 0 −ℝ 0 ) ≠ 0 → ( 0 −ℝ 0 ) = 1 ) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 0re | ⊢ 0 ∈ ℝ | |
| 2 | rennncan2 | ⊢ ( ( 0 ∈ ℝ ∧ 0 ∈ ℝ ∧ 0 ∈ ℝ ) → ( ( 0 −ℝ 0 ) −ℝ ( 0 −ℝ 0 ) ) = ( 0 −ℝ 0 ) ) | |
| 3 | 1 1 1 2 | mp3an | ⊢ ( ( 0 −ℝ 0 ) −ℝ ( 0 −ℝ 0 ) ) = ( 0 −ℝ 0 ) |
| 4 | re1m1e0m0 | ⊢ ( 1 −ℝ 1 ) = ( 0 −ℝ 0 ) | |
| 5 | 3 4 | eqtr4i | ⊢ ( ( 0 −ℝ 0 ) −ℝ ( 0 −ℝ 0 ) ) = ( 1 −ℝ 1 ) |
| 6 | rernegcl | ⊢ ( 0 ∈ ℝ → ( 0 −ℝ 0 ) ∈ ℝ ) | |
| 7 | 1 6 | ax-mp | ⊢ ( 0 −ℝ 0 ) ∈ ℝ |
| 8 | sn-00idlem1 | ⊢ ( ( 0 −ℝ 0 ) ∈ ℝ → ( ( 0 −ℝ 0 ) · ( 0 −ℝ 0 ) ) = ( ( 0 −ℝ 0 ) −ℝ ( 0 −ℝ 0 ) ) ) | |
| 9 | 7 8 | ax-mp | ⊢ ( ( 0 −ℝ 0 ) · ( 0 −ℝ 0 ) ) = ( ( 0 −ℝ 0 ) −ℝ ( 0 −ℝ 0 ) ) |
| 10 | 1re | ⊢ 1 ∈ ℝ | |
| 11 | sn-00idlem1 | ⊢ ( 1 ∈ ℝ → ( 1 · ( 0 −ℝ 0 ) ) = ( 1 −ℝ 1 ) ) | |
| 12 | 10 11 | ax-mp | ⊢ ( 1 · ( 0 −ℝ 0 ) ) = ( 1 −ℝ 1 ) |
| 13 | 5 9 12 | 3eqtr4i | ⊢ ( ( 0 −ℝ 0 ) · ( 0 −ℝ 0 ) ) = ( 1 · ( 0 −ℝ 0 ) ) |
| 14 | 7 | a1i | ⊢ ( ( 0 −ℝ 0 ) ≠ 0 → ( 0 −ℝ 0 ) ∈ ℝ ) |
| 15 | 1red | ⊢ ( ( 0 −ℝ 0 ) ≠ 0 → 1 ∈ ℝ ) | |
| 16 | id | ⊢ ( ( 0 −ℝ 0 ) ≠ 0 → ( 0 −ℝ 0 ) ≠ 0 ) | |
| 17 | 14 15 14 16 | remulcan2d | ⊢ ( ( 0 −ℝ 0 ) ≠ 0 → ( ( ( 0 −ℝ 0 ) · ( 0 −ℝ 0 ) ) = ( 1 · ( 0 −ℝ 0 ) ) ↔ ( 0 −ℝ 0 ) = 1 ) ) |
| 18 | 13 17 | mpbii | ⊢ ( ( 0 −ℝ 0 ) ≠ 0 → ( 0 −ℝ 0 ) = 1 ) |