Description: Closure law for subtraction of reals, restricted to nonnegative integers. (Contributed by Alexander van der Vekens, 6-Apr-2018)
Ref | Expression | ||
---|---|---|---|
Assertion | nn0resubcl |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | nn0re | ||
2 | nn0re | ||
3 | resubcl | ||
4 | 1 2 3 | syl2an |