theorem Th95:
  for x being FinSequence of REAL, A being Matrix of n,REAL st n>0
  & len x=n holds x*(A@) = A*x
proof
  let x be FinSequence of REAL,A be Matrix of n,REAL;
A1: len A=n & width A=n by MATRIX_0:24;
  assume n>0 & len x=n;
  hence thesis by A1,MATRIXR1:53;
end;
