定義
程函（eikonal）方程（也有稱短時距方程或幾何光學方程）是當使用WKB理論來近似波動方程時在波動傳播問題中碰到的非線性偏微分方程。它從電磁學的麥克斯韋爾方程組導出，並在物理 (波動)光學和幾何 (射線)光學之間起連線作用。
參閱
Hamilton–Jacobi equation
參考文獻
Paris, D. T. and Hurd F.K., Basic Electromagnetic Theory, McGraw-Hill 1969, pg. 383-385.
Arnold, V. I., Lectures on Partial Differential Equations, Springer 2004, 2nd Edition, pg. 2-3.
外部連結
The linearized eikonal equation
The eikonal equation was used for continuum crowd simulation by Treuille, Cooper, and Popović at The University of Washington Animation Research Labs
