The inclusion-exclusion principle for commuting projections
What's new 2021-02-23
Summary:
The (classical) Möbius function is the unique function that obeys the classical Möbius inversion formula: Proposition 1 (Classical Möbius inversion) Let be functions from the natural numbers to an additive group . Then the following two claims are equivalent: (i) for all . (ii) for all . There is a generalisation of this formula to […]