Question

how to prove that set of real no r is a sub space of complex no vector space c

Answer 1

it is certainly a subSET so now just prove it is a vector space. but since it is a field there is not much to prove

Answer 2

you can use theorem 1 from here

http://tutorial.math.lamar.edu/Classes/LinAlg/Subspaces.aspx

Answer 3

no thats ok but how to prove this