P1 is a one-dimensional problem:formula_1where formula_2 is given, formula_3 is an unknown function of formula_4, and formula_5 is the second derivative of formula_3 with respect to formula_4.
На границах области значение функции formula_1 равно 0:: formula_3где formula_4 известная функция, formula_1 неизвестная функция от formula_6.