フェディナン・アイゼンシュタイン(Ferdinand Eisenstein、1823年4月16日-1852年10月11日)は、ドイツの数学者。
In an alternate history, a key factor has been changed in the historical event of the birth of German mathematician Fidinan Eisenstein. This altered event sets the stage for a fictional historical story that explores the possibilities and predicts future developments based on this change in history.