What is the correct notation for “has opposite sign than”?
You could use $a b < 0$ for example. Or $a b \leq 0$ if $a$ or $b$ can be zero.
What is the correct notation for “has opposite sign than”?
You could use $a b < 0$ for example. Or $a b \leq 0$ if $a$ or $b$ can be zero.