let x1, x2, x3 be set ; :: thesis: for X being non empty finite set
for f being Function of (3 -tuples_on X),X
for S being Signature of X st x2 in the carrier of S & x3 in the carrier of S & not x1 in InnerVertices S & not Output (1GateCircStr <*x1,x2,x3*>,f) in InputVertices S holds
InputVertices (S +* (1GateCircStr <*x1,x2,x3*>,f)) = (InputVertices S) \/ {x1}
let X be non empty finite set ; :: thesis: for f being Function of (3 -tuples_on X),X
for S being Signature of X st x2 in the carrier of S & x3 in the carrier of S & not x1 in InnerVertices S & not Output (1GateCircStr <*x1,x2,x3*>,f) in InputVertices S holds
InputVertices (S +* (1GateCircStr <*x1,x2,x3*>,f)) = (InputVertices S) \/ {x1}
set p = <*x1,x2,x3*>;
let f be Function of (3 -tuples_on X),X; :: thesis: for S being Signature of X st x2 in the carrier of S & x3 in the carrier of S & not x1 in InnerVertices S & not Output (1GateCircStr <*x1,x2,x3*>,f) in InputVertices S holds
InputVertices (S +* (1GateCircStr <*x1,x2,x3*>,f)) = (InputVertices S) \/ {x1}
let S be Signature of X; :: thesis: ( x2 in the carrier of S & x3 in the carrier of S & not x1 in InnerVertices S & not Output (1GateCircStr <*x1,x2,x3*>,f) in InputVertices S implies InputVertices (S +* (1GateCircStr <*x1,x2,x3*>,f)) = (InputVertices S) \/ {x1} )
assume A1: ( x2 in the carrier of S & x3 in the carrier of S & not x1 in InnerVertices S ) ; :: thesis: ( Output (1GateCircStr <*x1,x2,x3*>,f) in InputVertices S or InputVertices (S +* (1GateCircStr <*x1,x2,x3*>,f)) = (InputVertices S) \/ {x1} )
A2: {x2,x3} c= the carrier of S by A1, ZFMISC_1:38;
rng <*x1,x2,x3*> = {x1,x2,x3} by FINSEQ_2:148
.= {x1} \/ {x2,x3} by ENUMSET1:42 ;
hence ( Output (1GateCircStr <*x1,x2,x3*>,f) in InputVertices S or InputVertices (S +* (1GateCircStr <*x1,x2,x3*>,f)) = (InputVertices S) \/ {x1} ) by A1, A2, Th40, ZFMISC_1:56; :: thesis: verum