% equation.s % % Purpose: Equation handling % Copyright: R.A. van Engelen, Leiden University, 1997 include declare. system is external(module = equation, result = nil). end_system is external(module = equation, result = nil). infix = is external(module = equation, result = nil). infix on is external(module = equation, result = nil). % Syntax: LHS = RHS % Example: [u, v] = grad p.