Description: A positive real is greater than zero. (Contributed by Mario Carneiro, 28-May-2016)
Ref | Expression | ||
---|---|---|---|
Hypothesis | rpred.1 | |- ( ph -> A e. RR+ ) |
|
Assertion | rpgt0d | |- ( ph -> 0 < A ) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | rpred.1 | |- ( ph -> A e. RR+ ) |
|
2 | rpgt0 | |- ( A e. RR+ -> 0 < A ) |
|
3 | 1 2 | syl | |- ( ph -> 0 < A ) |