Nicolaos Ch. Nikolaidis (Greek: Νικόλαος Χ. Νικολαΐδης, in French Nicolas Nicolaïdès; (1826 - July 11, 1889) was an author, mechanical engineer, mathematician, soldier, and professor. He was one of the most influential mathematicians in Greece during the later part of the 19th century. He went to school at Evelpidon and studied in France at the École des ponts Paris Tech and École Polytechnique. His professors in France included Joseph Bertrand and Adhémar Jean Claude Barré de Saint-Venant. While in France he was exposed to the complex mathematics prevalent at the time. He wrote papers on geometry and kinematics. He was exposed to the works of Jacques Charles François Sturm, Giovanni Fagnano, Colin Maclaurin, Joseph Bertrand, and Jacques Antoine Charles Bresse. He integrated some of their