Someone could help to prove the following inequality of modulus of complex numbers:
If $a\in\mathbb{C}$ then $$|a|\leq|a+z| \qquad \forall z\in\mathbb{C}$$
Someone could help to prove the following inequality of modulus of complex numbers:
If $a\in\mathbb{C}$ then $$|a|\leq|a+z| \qquad \forall z\in\mathbb{C}$$