A matrix in mathematics is conformable, if its dimensions are suitable for some operation (addition, multiplication, etc.). In order to be conformable to addition, matrices need to have the same dimension, so that in
A + B = C,
A, B and C all have to have the same 
dimension. For multiplication, in the formula
A * B = C,
if A has dimension , then B has to be 
for some p, giving C as 
See also
