Notes for BBS/BCHKW-110516-160040.jpg
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[math]\displaystyle{ \delta(E_{i,i+k}) = E_{i,i+k}\wedge(E_{i,i}-E_{i+k,i+k}) + 2\sum_{j=1}^{k-1} E_{i+j,i+k}\wedge E_{i,i+j} }[/math]
[math]\displaystyle{ \delta(E_{i+k,i}) = E_{i+k,i}\wedge(E_{i,i}-E_{i+k,i+k}) + 2\sum_{j=1}^{k-1} E_{i+k,i+j}\wedge E_{i+j,i} }[/math]
[math]\displaystyle{ \delta(E_{i,i}) = 0 }[/math]
