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Pronunciation varies by accent · adjective
(group theory) Being an analogue of the Heisenberg group over a finite field whose size is a prime..
Use extra special when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Extra special means (group theory) Being an analogue of the Heisenberg group over a finite field whose size is a prime..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use extra special where its definition matches the intended context.
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