Recent content by tukilala

Let A be a set. For every set B and total function f:A->B we define a relation R on A by R={(x,y) belonging to A*A:f(x)=f(y)} *belonging to - because i don't know how to make the symbole... Prove that f is one-to-one if and only if the equivalence classes of R are all singletones

200 degrees

A(0,0) and i know that AB=4 BC=3 AC =5 BC goes diagonally downward into the direction of the third "quadrant". how can i find C(x,y) ? thnx