-
Recent Posts
Blogroll
Archives
Tags
- ac.commutative-algebra
- ag.algebraic-geometry
- ap.analysis-of-pdes
- at.algebraic-topology
- co.combinatorics
- ct.category-theory
- cv.complex-variables
- dg.differential-geometry
- fa.functional-analysis
- field-theory
- general-topology
- geometric-topology
- gr.group-theory
- harmonic-analysis
- lie-algebras
- lie-groups
- linear-algebra
- measure-theory
- metric-spaces
- nt.number-theory
- polynomials
- ra.rings-and-algebras
- rewriting-systems
- rt.representation-theory
- vector-bundles
Tag Archives: co.combinatorics
A bijective proof of a classical identity involving the totient function
In this post we’ll give a simple bijective proof of the well-known identity . If we write down the expressions and then put each one of them in their irreducible form, we have that each divisor of appears exactly times … Continue reading
ferngaston 