First of all thank you for your time. Is it know when the next identity holds?
Links with more resources on this identity would be grateful
Thank you a lot
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In a field with characteristic p it is true that , you just use the binomial formula to see why all the cross terms cancel out. For instance is an example of a field of characteristic p.
This was a little bit dummy question, the actual issue was
Which this is obvious for any A,B and for s>1
Anyway thank you
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