let S1, S2, S be non empty non void Circuit-like ManySortedSign ; :: thesis: ( InnerVertices S1 misses InputVertices S2 & S = S1 +* S2 implies for C1 being non-empty Circuit of S1
for C2 being non-empty Circuit of S2
for C being non-empty Circuit of S st C1 tolerates C2 & C = C1 +* C2 holds
for s2 being State of C2
for s being State of C st s2 = s | the carrier of S2 holds
Following s2 = () | the carrier of S2 )

assume A1: ( InnerVertices S1 misses InputVertices S2 & S = S1 +* S2 ) ; :: thesis: for C1 being non-empty Circuit of S1
for C2 being non-empty Circuit of S2
for C being non-empty Circuit of S st C1 tolerates C2 & C = C1 +* C2 holds
for s2 being State of C2
for s being State of C st s2 = s | the carrier of S2 holds
Following s2 = () | the carrier of S2

let C1 be non-empty Circuit of S1; :: thesis: for C2 being non-empty Circuit of S2
for C being non-empty Circuit of S st C1 tolerates C2 & C = C1 +* C2 holds
for s2 being State of C2
for s being State of C st s2 = s | the carrier of S2 holds
Following s2 = () | the carrier of S2

let C2 be non-empty Circuit of S2; :: thesis: for C being non-empty Circuit of S st C1 tolerates C2 & C = C1 +* C2 holds
for s2 being State of C2
for s being State of C st s2 = s | the carrier of S2 holds
Following s2 = () | the carrier of S2

let C be non-empty Circuit of S; :: thesis: ( C1 tolerates C2 & C = C1 +* C2 implies for s2 being State of C2
for s being State of C st s2 = s | the carrier of S2 holds
Following s2 = () | the carrier of S2 )

assume that
A2: C1 tolerates C2 and
A3: C = C1 +* C2 ; :: thesis: for s2 being State of C2
for s being State of C st s2 = s | the carrier of S2 holds
Following s2 = () | the carrier of S2

let s2 be State of C2; :: thesis: for s being State of C st s2 = s | the carrier of S2 holds
Following s2 = () | the carrier of S2

let s be State of C; :: thesis: ( s2 = s | the carrier of S2 implies Following s2 = () | the carrier of S2 )
assume A4: s2 = s | the carrier of S2 ; :: thesis: Following s2 = () | the carrier of S2
the Sorts of C1 tolerates the Sorts of C2 by ;
then reconsider s1 = s | the carrier of S1 as State of C1 by ;
( dom () = the carrier of S2 & Following s = () +* () ) by ;
hence Following s2 = () | the carrier of S2 by FUNCT_4:23; :: thesis: verum