The handwritten page, part of an appendix to a 1930 paper on the Nobel winner's efforts towards a unified field theory, was discovered among the 110-page trove the university's Albert Einstein archives received some two weeks ago.
Hebrew University unveiled the collection to coincide what would have been Einstein's 140th birthday on March 14.
Most of the documents constitute handwritten mathematical calculations behind Einstein's scientific writings in the late 1940s.
There are also letters that Einstein, born in Germany in 1879, wrote to collaborators that deal with a range of scientific and personal issues, including one to his son, Hans Albert.
The 1935 letter to his son expresses concern about the rise of the Nazi party in Germany.
Nearly all the documents had been known to researchers and available in the form of copies—"sometimes better copies, sometimes very poor copies", said Hanoch Gutfreund, scientific advisor to the university's Einstein archives.