**Carl Gustav Jacob Jacobi** (December 10, 1804 – February 18, 1851), widely known as Gustav Jacobi, was a German mathematician.

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*[J]eder Fortschritt in der Theorie der partiellen Differentialgleichungen auch einen Fortschritt in der Mechanik herbeiführen muss.*- Any progress in the theory of partial differential equations must also bring about a progress in Mechanics.
*Vorlesungen über Dynamik*[*Lectures on Dynamics*] (1842/3; publ. 1884) [1]

- Wherever Mathematics is mixed up with anything, which is outside its field, you will find attempts to demonstrate these merely conventional propositions a priori, and it will be your task to find out the false deduction in each case.
*Vorlesungen über analytische Mechanik*[*Lectures on Analytical Mechanics*] (1847/48; edited by Helmut Pulte in 1996)