Description: The number 0 is real, deduction form. (Contributed by David A. Wheeler, 6-Dec-2018)
Ref | Expression | ||
---|---|---|---|
Assertion | 0red | $${\u22a2}{\phi}\to 0\in \mathbb{R}$$ |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 0re | $${\u22a2}0\in \mathbb{R}$$ | |
2 | 1 | a1i | $${\u22a2}{\phi}\to 0\in \mathbb{R}$$ |