Eisenstein had been studying quadratic forms in n variables with integer coefficients at the time he published his unproved formula in 1847 but as he was already ill by this time details were never published.
Eisenstein had been pag-aaral parisukat forms sa n variable na may integer coefficients sa oras na siya nai-publish na ang kanyang unproved formula sa 1847 ngunit bilang siya ay may sakit sa pamamagitan ng mga detalye ng mga oras na ito ay hindi nai-publish.