How to do matrix equality testing for symbols?

In the documentation I found this example.

A = [1+i 3 2 4+i];
B = [1 3+i 2 4+i];
A == B

The result is:

ans = 1x4 logical array
   0   0   1   1

How can I make the == operator work for symbols? I tried below example:

syms a b [3 1] real
r1 = a*b';
r2 = b*a';
r1 == r2

and the result is:

Is it possible to compare symbol expressions?

Answer 1

[madhan ravi]

syms a b [3 1] real 
assume([a, b] > 0)
r1 = a*b';
r2 = b*a';
isAlways(r1 == r2) % indeed with a warning