Provided by: librheolef-dev_6.6-1build2_amd64

**NAME**

test,trial- symbolic arguments in variational expressions

**DESCRIPTION**

These classes are used for test and trial functions involved in variational formulations. Variational formulations could be specified by expressions, in the spirit of c++ embeded languages. A variable of thetesttype represents the formal argument (the test-function) in the definition of a linear form, as in: geo omega ("circle"); space Xh (omega, "P1"); test v(Xh); field lh = integrate (omega, 2*v); For a bilinear form, the test-function represents its second formal argument, while the first one is designed by thetrialtype: trial u(Xh); test v(Xh); form m = integrate (omega, u*v), a = integrate (omega, dot(grad(u),grad(v))); Thefield_vfclass is abble to represents eithertestortrialtypes: it could be used to formaly define a differential operator, as: D(u) = (grad(u)+trans(grad(u)))