Description: _i is not 1. (Contributed by SN, 25-Apr-2025)
Ref | Expression | ||
---|---|---|---|
Assertion | ine1 | ⊢ i ≠ 1 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 1re | ⊢ 1 ∈ ℝ | |
2 | inelr | ⊢ ¬ i ∈ ℝ | |
3 | nelne2 | ⊢ ( ( 1 ∈ ℝ ∧ ¬ i ∈ ℝ ) → 1 ≠ i ) | |
4 | 1 2 3 | mp2an | ⊢ 1 ≠ i |
5 | 4 | necomi | ⊢ i ≠ 1 |