From the blog
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n-agonal numbers
Numbers are awesome. Here’s why. Yesterday I made a video about the so-called “n-gonal numbers”. I’ll explain what they are as we go. Let’s start…
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A Diophantine sistem.
We want to determine all integers x₁,…,x₂₀₁₁ such that If such integers exist, by Fermat’s little theorem we would have that xi⁷=xi (mod 7) for…
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If K is a field (K,+) it is not isomorphic to (K{0},•).
Let (K,+,•) be a field, let us prove that its additive group (K,+) is not isomorphic to the group of invertibles of K, that is…
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Ring with 4 elements
Let R be a unit ring with 4 elements. Let us prove that R is commutative. R ={0,1,a,b}. Let x,y be in R and let…
Marco Damele 