Semi-Cohen Versus Cohen Algebras
英文摘要：
We show that there are semi-Cohen Boolean algebras which cannot be completely embedded into Cohen Boolean algebras. Using the ideas from this proof, we give a simpler argument for a theorem of S. Koppelberg and S. Shelah, stating that there are complete subalgebras of Cohen algebras which are not Cohen themselves.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
