One of the mysteries of the English language finally explained.
A function [u, v] of two dynamical variables u(p₁, p₂,…pₙ, q₁, q₂,…qₙ) and v(p₁, p₂,…pₙ, q₁, q₂,…qₙ) equal to ∑n r = 1 ∂u/∂qr ∂v/∂pr − ∂u/∂pr ∂v/∂qr.
Early 20th century.
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