While searching our database we found 1 possible solution for the: Leonhard —, 18th-century mathematician noted for his work on the calculus of variation crossword clue. This crossword clue was last seen on 06 September 2022 The The Mirror Quiz Crossword puzzle. The solution we have for Leonhard —, 18th-century mathematician noted for his work on the calculus of variation has a total of 5 letters.