let n be Element of NAT ; :: thesis: for K being Field
for M1, M2 being Matrix of n,K st M1 is col_circulant & M2 is col_circulant holds
M1 - M2 is col_circulant
let K be Field; :: thesis: for M1, M2 being Matrix of n,K st M1 is col_circulant & M2 is col_circulant holds
M1 - M2 is col_circulant
let M1, M2 be Matrix of n,K; :: thesis: ( M1 is col_circulant & M2 is col_circulant implies M1 - M2 is col_circulant )
assume A1: ( M1 is col_circulant & M2 is col_circulant ) ; :: thesis: M1 - M2 is col_circulant
then - M2 is col_circulant by Th25;
hence M1 - M2 is col_circulant by A1, Th21; :: thesis: verum