Is infinity a real number?
2742
Is infinity a number?
20696
How to check if an expression is a real-valued number
156946
The set of real numbers is a subset of the set of complex numbers?
130149
Computablility of a real number
41262
Does the concept of infinity have any practical applications?
58636
Do the real numbers and the complex numbers have the same cardinality?
25788
Prove that $i^i$ is a real number
3645
Why Are the Reals Uncountable?
146560
Is there any uncountably infinite set that does not generate the reals?
132525
Real Numbers Raised to Imaginary Powers?
11405
If a nonempty set of real numbers is open and closed, is it $\mathbb{R}$? Why/Why not?
59385
Are there number systems corresponding to higher cardinalities than the real numbers?
118573
Why is the Axiom of Infinity necessary?
27567
What is zero times infinity?
63748
What does it mean that the universe is "infinite"?
21606
Can all real numbers be represented by the sum of a convergent series?
27290
What Does it Really Mean to Have Different Kinds of Infinities?