Tagged Questions
3
votes
1answer
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maximal antichain
I don't understand the definition of Jech (set theory) for "maximal antichain". Let $B$ a boolean algebra and $A$ a subalgebra of $B$.
$W\subseteq A^+$ is a maximal antichain if $\sum W=1$ and $W$ ...
2
votes
1answer
172 views
Free boolean algebra
Consider the following definition:
Let $X$ be a set and $e : X \mapsto A$ a mapping to a boolean algebra
$A.$ We say that $A$ is free over $X$ (with respect to $e$) if for
every mapping $f:X ...
