Elements of Algebra is a mathematics textbook by the famous mathematician Leonhard Euler, originally published circa 1765. The original german name is: Vollständige Anleitung zur Algebra, which literally means: Complete Instruction to Algebra. The Elements of Algebra contains many important early results in mathematical analysis; for example, it contains Euler's original proof of Fermat's Last Theorem for the special case of n = 3.
In 1771, Joseph Lagrange published a follow-up volume entitled Additions to Euler's Elements of algebra, which featured a number of important mathematical results.