Which of the following statements about logical reasoning is false?

Group of answer choices

Entailment of $\backslash$alpha from $$ can be shown by proving $(\backslash$alpha $\backslash$beta $)$ is unsatisfiable

If $(\backslash$alpha $\backslash$beta $)$ is valid, then we can we can infer $\backslash$alpha $|=\backslash$beta

$(\backslash$alpha $\backslash$beta $)$ is satisfiable iff $(\backslash$alpha V $\backslash$beta $)$ is not valid

$\backslash$alpha is satisfiable iff $\backslash$alpha is not valid