Description: Closure of the Möbius function. (Contributed by Mario Carneiro, 22-Sep-2014)
Ref | Expression | ||
---|---|---|---|
Assertion | mucl | |- ( A e. NN -> ( mmu ` A ) e. ZZ ) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | muf | |- mmu : NN --> ZZ |
|
2 | 1 | ffvelrni | |- ( A e. NN -> ( mmu ` A ) e. ZZ ) |