Etymology

Jackson integral

Today it means: The series expansion ∫₀ᵃf(x),rm d_qx=(1-q),a∑ₖ₌₀ ᪲qᵏf(qᵏa). for real variable a and function of a real variable f(x). Full definition →

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The story

Introduced by Frank Hilton Jackson.

Etymology from Wiktionary, CC BY-SA 4.0.