Can I suggest Gödel Escher Bach by Douglas Hofstadter. Its more on the maths side but has many short stories in it. Also if you are more into the physics side

Can I suggest Gödel Escher Bach by Douglas Hofstadter. Its more on the maths side but has many short stories in it. Also if you are more into the physics side of mathematics you might enjoy Greg Egan who writes sci-fi with ideas like about what if the speed of light was promotional to frequency. He also recently published some new adavances in the field of super permutations.