Does there exist an operation that could turn the set of all negative real numbers into an abelian group?
73056
Operation that makes the negative real numbers, $\mathbb{R}_{<0}$, a group
70196
Is there any well-ordered uncountable set of real numbers under the original ordering?
132525
Real Numbers Raised to Imaginary Powers?
2153
How to get a homomorphism from $\mathbb{Z}\to G$, for $G$ a non-trivial group?
76914
Integer division by negative number
5022
Can a set containing $0$ be purely imaginary?
125719
Multiplicative inverse of a complex number.
143051
Inverting noninvertible elements in a bigger ring.
18911
Finding real roots of negative numbers (for example, $\sqrt[3]{-8}$)
71044
Can the square root of a real number be negative?
9737
Complex number operations: telling Mathematica variables are real
55976
Are groups satisfying $g=g^{-1}$ for all $g \in G$ abelian?
68128
Two term free resolution of an abelian group.
3606
Wild automorphisms of the complex numbers
64896
Dealing with non-integral powers on negative numbers
119160
Isomorphism between complex numbers minus zero and unit circle
134858
Abelian Group Homomorphism