studying of factor of water equality solve 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

servomechanism-type problem servo problem

Agriculture,Peasant,Countryside problem

cold-drawing mill problem

countryside,peasant,agriculture problem

four mine problem

Problem Students in universities and colleges

San Nong problem

three agricultures problem

three dimensional fishery problem

tri-agro problem

#P-complete problem

(generalized) Euclidean Steiner problem

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