Question About A Problem About Rational Numbers
120430
A question about how to express a fraction as ${1\over q_1}+{1\over q_2}+ \cdots+{1\over q_N}$
85895
Proving all rational numbers including negatives are countable
15110
About irrational logarithms
29780
If $x$ is a positive rational but not an integer, is $x^x$ irrational?
126074
Proof of the irrationality of $\sqrt{3}$ - logic question
44573
Can $\pi$ be rational in some base radix
31744
Proving that there is an irrational number between any two unequal rational numbers.
100399
A doubt with a part of a certain proof.
144244
Bound on difference between irrational square root and rational number
150576
When is an Integer a Rational Number, and are All Ratios Rational, Even $\frac{\sqrt{7}}{2}$?
127830
proof that $\sqrt(2)$ is irrational / why is the fraction irreducible
66210
Prove that $z^n + 1/{z^n}$ is a rational number
81428
Why does proof by contradiction not work on Rational numbers but only on Irrational numbers?
83145
Sum of rational numbers
156646
If $x$ is rational then $\,x+\frac{1}x \,$ is an integer $\iff x = \pm 1$
116970
On the number divisors of a number
32848
Prove that the product of a non-zero rational and irrational number is irrational.