Description: There exist at most one set such that F. is true. (Contributed by Anthony Hart, 13-Sep-2011)
Ref | Expression | ||
---|---|---|---|
Assertion | mofal | ⊢ ∃* 𝑥 ⊥ |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | nexfal | ⊢ ¬ ∃ 𝑥 ⊥ | |
2 | exmo | ⊢ ( ∃ 𝑥 ⊥ ∨ ∃* 𝑥 ⊥ ) | |
3 | 1 2 | mtpor | ⊢ ∃* 𝑥 ⊥ |