Is the following inference valid provided that the variable $z$ does not occur free in $\Gamma$ (Note: No restriction regarding whether or not $z$ occurs free in $\phi$ is assumed) ? $${ \Gamma \vdash \phi \over \Gamma \vdash \forall z.\phi }$$
2026-04-04 17:26:59.1775323619
Is this inference valid?
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