I am currently doing a project on irrational and transcendental numbers and part of this project requires me to look at sums and products of irrational numbers.
I am aware that the sum of 2 irrational numbers can be rational or irrational but was wondering if anyone knew of a definite way to look at the numbers and say if their sum/product will be rational/irrational. Is there some sort of theorem than can be applied or is the only way of knowing just working it out?
Thanks in advance for any help.