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boolean_algebras [2010/09/04 16:55]
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boolean_algebras [2010/09/04 17:13] (current)
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==Morphisms== ==Morphisms==
-Let $\mathbf{A}$ and $\mathbf{B}$ be Boolean algebras. A morphism from $\mathbf{A}$ to $\mathbf{B}$ is a function $h:Aarrow B$ that is a homomorphism: +Let $\mathbf{A}$ and $\mathbf{B}$ be Boolean algebras. A morphism from $\mathbf{A}$ to $\mathbf{B}$ is a function $h:A\to B$ that is a homomorphism:
$h(x\vee y)=h(x)\vee h(y)$, $h(-x)=-h(x)$ $h(x\vee y)=h(x)\vee h(y)$, $h(-x)=-h(x)$
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====Definition==== ====Definition====
A \emph{Boolean algebra} is a [[Heyting algebra]] $\mathbf{A}=\langle A \emph{Boolean algebra} is a [[Heyting algebra]]$\mathbf{A}=\langle
-A,\vee ,0,\wedge ,1,arrow \rangle $such that+A,\vee ,0,\wedge ,1,\to\rangle$ such that
-$xarrow 0$ is an involution:  $( xarrow 0) arrow 0=x$+$\to 0$ is an involution:  $(x\to 0)\to 0=x$
====Examples==== ====Examples====
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[[Complete Boolean algebras]] [[Complete Boolean algebras]]
+
====Superclasses==== ====Superclasses====
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====References==== ====References====
-[(Ln19xx>
-)]