▁Category : 2 0 th - century ▁British ▁botan ists ▁Category : English ▁em igr ants ▁to ▁colonial ▁Australia <0x0A> </s> ▁Any ▁kind ▁of ▁logic , ▁function , ▁expression , ▁or ▁theory ▁based ▁on ▁the ▁work ▁of ▁George ▁Bo ole ▁is ▁considered ▁Boolean . ▁▁▁ ▁Rel ated ▁to ▁this , ▁" Boolean " ▁may ▁refer ▁to : ▁▁ ▁Boolean ▁data ▁type , ▁a ▁form ▁of ▁data ▁with ▁only ▁two ▁possible ▁values ▁( us ually ▁" true " ▁and ▁" false ") ▁ ▁Boolean ▁algebra , ▁a ▁logical ▁calculus ▁of ▁truth ▁values ▁or ▁set ▁membership ▁ ▁Boolean ▁algebra ▁( structure ), ▁a ▁set ▁with ▁operations ▁res emb ling ▁logical ▁ones ▁ ▁Boolean ▁domain , ▁a ▁set ▁consisting ▁of ▁exactly ▁two ▁elements ▁whose ▁interpret ations ▁include ▁false ▁and ▁true ▁ ▁Boolean ▁circuit , ▁a ▁mathematical ▁model ▁for ▁digital ▁logical ▁circ uits . ▁ ▁Boolean ▁expression , ▁an ▁expression ▁in ▁a ▁programming ▁language ▁that ▁produces ▁a ▁Boolean ▁value ▁when ▁evaluated ▁ ▁Boolean ▁function , ▁a ▁function ▁that ▁determ ines ▁Boolean ▁values ▁or ▁operators ▁ ▁Boolean ▁model ▁( prob ability ▁theory ), ▁a ▁model ▁in ▁st ochastic ▁geometry ▁ ▁Boolean ▁network , ▁a ▁certain ▁network ▁consisting ▁of ▁a ▁set ▁of ▁Boolean ▁variables ▁whose ▁state ▁is ▁determined ▁by ▁other ▁variables ▁in ▁the ▁network ▁ ▁Boolean ▁processor , ▁a ▁ 1 - bit ▁variable ▁computing ▁unit ▁▁ ▁Boolean ▁ring , ▁a ▁mathematical ▁ring ▁for ▁which ▁x 2 ▁= ▁x ▁for ▁every ▁element ▁x ▁ ▁Boolean ▁satisf i ability ▁problem , ▁ ▁the ▁problem ▁of ▁determ ining ▁if ▁there ▁exists