theorem Th06: :: PASCAL:6

for K being Field
for a, b, c, d, e, f, g, h, i being Element of K
for M being Matrix of 3,K st M = <*<*a,b,c*>,<*d,e,f*>,<*g,h,i*>*> & M is symmetric holds
( b = d & c = g & h = f )