Let \(a > 0\) be a positive real number. The equation \[x^2=a\] has two real solutions \(x_1,x_2\in\mathbb R\), called the square roots of the number \(a\) and denoted by \(x_1:=\sqrt a\) and \(x_2:=- \sqrt a\).
Proofs: 1
Definitions: 1 2
Proofs: 3 4 5 6 7
Propositions: 8
Solutions: 9
Topics: 10 11