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Pronunciation varies by accent · noun
An n-dimensional hypersphere: the 2-sphere is a circle, the 3-sphere is the usual sphere, the 4-sphere is a glome, etc..
Use n-sphere when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
N-sphere means An n-dimensional hypersphere: the 2-sphere is a circle, the 3-sphere is the usual sphere, the 4-sphere is a glome, etc..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use n-sphere where its definition matches the intended context.
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