I'm huge confused!

There is nonzero primitive element in finite dimensional pointed hopf algebra over complex field???

I find in several articles,it is said that a is primitive,so a=0.

I will appreciate if someone can give me some clue.

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I'm huge confused!

There is nonzero primitive element in finite dimensional pointed hopf algebra over complex field???

I find in several articles,it is said that a is primitive,so a=0.

I will appreciate if someone can give me some clue.

onequestion mark. $\endgroup$