singular problem

singular-problem

auxiliary variational problem

canonical variational problem

cross-constrained variational problem

fixed end point variational problem

fractional variational problem

Gauss variational problem

homogeneous variational problem

multiobjective variational problem

positively definite variational problem

semidefinite variational problem

unilateral variational problem

variational problem

Developing Problem Situation Problem Posing

Developing Problem Situations Problem Posing

Fermi-Pasta-Ulam problem， FPU problem

linear programming problem LP problem

servo problem servomechanism-type problem