(calculus) partial differential equation

(mathematics) differential equation

all night

(calculus) ordinary differential equation

a night

to discover, to find (e.g. an error in a book) / to find (e.g. something missing)

to discover, to find (e.g. an error in a book); to find (e.g. something missing)

Alternative form of 見付ける

to work at a job, to labour / to work properly, to operate, to function; to carry out one's function, to be effective, to come into play / to perpetrate or commit a crime

(mathematics) differentiation