Fredholm wrote papers with great care and attention so he produced work of high quality which quickly gained him a high reputation throughout Europe. However his papers required so much effort from him that he wrote only a few and in fact his Complete Works in mathematics comprises of only 160 pages.
Fredholm wrote papeles na may mahusay na pag-aalaga at atensiyon kaya siya ginawa ng trabaho ng mataas na kalidad na kung saan mabilis na nagkamit siya ng isang mataas na reputasyon sa buong Europa. Subalit ang kanyang mga papeles na kinakailangan upang marami pagsisikap mula sa kanya na siya wrote lamang ng ilang at sa katunayan kanyang Complete Works sa matematika comprises lamang ng 160 na pahina.