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A birotunda in which the bases are in opposite orientations.

A cupolarotunda in which the bases are in opposite orientations.

Johnson solid J_(24).

Johnson solid J_(47).

Johnson solid J_(23).

A type of integral named after Henstock and Kurzweil. Every Lebesgue integrable function is HK integrable with the same value.

The integral associated with the Haar measure.

The vectors +/-a_1, ..., +/-a_n in a three-space form a normalized eutactic star iff Tx=x for all x in the three-space.

The sporadic group HJ, also denoted J_2.

A curve and its polar reciprocal with regard to the fixed conic have the same Halphen transformation.