consider xx1 being Element of X1, xx2 being Element of X2, xx3 being Element of X3, xx4 being Element of X4, xx5 being Element of X5, xx6 being Element of X6 such that
A10:
x = [xx1,xx2,xx3,xx4,xx5,xx6]
by A1, Th55;
take
xx3
; for x1, x2, x3, x4, x5, x6 being set st x = [x1,x2,x3,x4,x5,x6] holds
xx3 = x3
thus
for x1, x2, x3, x4, x5, x6 being set st x = [x1,x2,x3,x4,x5,x6] holds
xx3 = x3
by A10, Th45; verum