My career began as an officer for Napoleon supervising French engineers building fortifications, but twice had to flee France due to my strong Republican stance.
Eventually, after helping wage wars with mass armies and strategic planning, I was forced to seek exile in the Magdeburg in Prussia, content with taking afternoon walks in view of the Elbe river.
With my son Sadi, I contributed to the use of thermodynamics in designing steam engines.
My text in infinitesmial calculus reflected traditional views of mathematics, not the new thoughts of Euler, Lagrange, or d'Alembert.
For example, I believed in the intuitive concept of quantity...and avoided the Euler's idea of a function, preferring to focus on equations.
When working with equations, I required that the quantities involved be real...that is, I argued that negative quantities were impossible "chimeras," zero and infinity were limits and not values, and yet infinitely small quantities were real objects.
In geometry, I focused on contributing ideas in projective rather than descriptive geometry, and am credited with the first use of cross-ratios.
Lazare Nicolas Marguerite Carnot (1753 - 1823)