This problem per se is quite clumsy to solve in closed form.
When the difference of two closed forms is an exact form, they are said to be cohomologous to each other.
There are some functions whose antiderivatives cannot be expressed in closed form.
The estimates do not have a closed form and must be obtained numerically.
This approach gives explicit (closed form) prices to barrier options.
A conservative force can be expressed in the language of differential geometry as a closed form.
Also in the style of earlier Western music, his work demonstrates closed form.
However, because the overall course is fixed, it is a closed form.
The recognition of a closed form is so intense that it seems to condense.
Some of them allow appropriate fluid dynamics problems to be solved in closed form.