The Free On-line Dictionary of Computing (30 December 2018):

Equational Programming Language

    (EPL) An equational language for parallel
   scientific applications, developed by RPI. Szymanski.

   ["EPL - Parallel Programming with Recurrent Equations",
   B. Szymanski in Parallel Functional Languages and Compilers,
   B. Szymanski et al, A-W 1991].

   (2010-09-21)