Show that all irreducible representations of a finite group are finite dimensional.
We know for any representation V of a finite group G, there is a decomposition V=V1⊕V2⊕.....⊕Vn where Vi s are all irreducibles. Now if we make V irreducibles then just one V=V1(say) will be there. But how can we show V is finite dimensional?Any help will be apreciated..
Answer
Pick v∈V nonzero and consider C[G]v, the C-span of v‘s orbit under G.
Attribution
Source : Link , Question Author : Ri-Li , Answer Author : whacka