this was to find a closed form for the sum of the infinite series (2) = (1/n2), a problem which had defeated many of the top mathematicians including jacob bernoulli , johann bernoulli and daniel bernoulli .

Make this proper case.
This was to find a closed form for the sum of the infinite series (2) = (1/n2), a problem which had defeated many of the top mathematicians including Jacob Bernoulli , Johann Bernoulli and Daniel Bernoulli .