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Construction junctions are diamonds. They show where multiple structures must coexist on the same carrier and satisfy compatibility conditions.
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No alternate terminology is currently authored for this record.
Carrier(s)
bialgebra H
Data
antipode S:H→H
Axioms / constraints
convolution inverse laws
Notes
For a fixed bialgebra structure, an antipode is unique if it exists; Hopf algebra status is therefore an existence property, not a free choice of extra map.