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Paolo Aluffi's book "Algebra: Chapter 0" mentions that compactness of first order logic is sufficient to prove this (p. 403). I don't know the ultrafilter lemma.
Paolo Aluffi's book "Algebra: Chapter 0" mentions that compactness of first order logic is sufficient to prove this. I don't know the ultrafilter lemma.
Paolo Aluffi's book "Algebra: Chapter 0" mentions that compactness of first order logic is sufficient to prove this (p. 403). I don't know the ultrafilter lemma.
Paolo Aluffi's book "Algebra: Chapter 0" mentions that compactness of first order logic is sufficient to prove this. I don't know the ultrafilter lemma.
