
theorem
for L being non empty ZeroStr
for a,b,c being Element of L holds deg <%c,b,a%> <= 2
proof
let L be non empty ZeroStr; let a,b,c be Element of L;
len <%c,b,a%> - 1 <= 3 - 1 by qua2,XREAL_1:9;
hence thesis by HURWITZ:def 2;
end;
