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In the Wikipedia page on the Karp–Lipton theorem it is mentioned that $$\Sigma_2\not\subseteq\mathsf{SIZE}(n^k)$$ (which is known) is not same as $$\Sigma_2\not\subseteq\mathsf{P/Poly}$$ (which is open). I was of the opinion $\mathsf{P/Poly}$ referred to polynomial size circuits which seems same ...