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キーワード:
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要旨:
We show that given two Boolean
circuits $f$ and $g$ the following three problems are $\Sigma^p_2$-complete:
(1) Is $f$ a c-subfunction of $g$, i.e.\ can one set some of the variables
of $g$ to 0 or 1 so that the remaining circuit computes the same function
as $f$?
(2) Is $f$ a v-subfunction of $g$, i.e. can one change the names of the
variables of $g$ so that the resulting circuit computes the same function
as $f$?
(3) Is $f$ a cv-subfunction of $g$, i.e.\ can one
set some variables of $g$ to 0 or 1 and simultanously
change some names of the other variables of $g$ so that the new circuit
computes the same function as $f$?
Additionally we give some bounds for the complexity of the following
problem: Is $f$ isomorphic to $g$, i.e. can one change the names of the
variables bijectively so that the circuit resulting from $g$ computes the
same function as $f$?
