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About: Primitive element (co-algebra)     Goto   Sponge   NotDistinct   Permalink

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In algebra, a primitive element of a co-algebra C (over an element g) is an element x that satisfies where is the co-multiplication and g is an element of C that maps to the multiplicative identity 1 of the base field under the co-unit (g is called group-like). If C is a bi-algebra, i.e., a co-algebra that is also an algebra (with certain compatibility conditions satisfied), then one usually takes g to be 1, the multiplicative identity of C. The bi-algebra C is said to be primitively generated if it is generated by primitive elements (as an algebra).