Replied to a post by copying from a word document and the subscripting didn't carry over.
However, subscripting carried over to a new post, as shown below.
Now, out of curiousity, I will reply to this post by copying the same material from the Word document and see what happens.
s112+s222+s332)2 = s114+s224+s334 + 2(s112s222+ s112s332+ s222s332)
(s11+s22+s33)2 = s112+s222+s332 + 2(s11s22+ s11s33+ s22s33) = 0 because sii=0. So
s112+s222+s332 = -2(s11s22+ s11s33+ s22s33)
(s112+s222+s332)2 = 4[s112s222+s112s332+s222s332 + 2(s11+s22+s33)(s11s22s33) and sii=0. So
s112s222+s112s332+s222s332 = ¼(s112+s222+s332)2 and substitute this into first eq to get:
s114+s224+s334 = ½(s112+s222+s332)2 , or in indicial notation:
sii4 = sii2sjj2