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  • (cur | prev) 15:12, 27 April 2017HelmutKnaust (Talk | contribs)‎ . . (+1,993)‎ . . (Created page with "'''Problem 31.''' The relation "$\preceq$" on a Boolean Algebra ${\cal B}$ defined by $A\preceq B \Leftrightarrow A\sqcup B=B$ for $A,B\in{\cal B}$ is a partial order (cp. ...")
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