1. Weierstrass also made significant advancements in the field of calculus of variations . 2. He did research on differential equations, the calculus of variations and mechanics. 3. Noether's theorem is used in theoretical physics and the calculus of variations . 4. His specialisms included nonlinear partial differential equations and calculus of variations . 5. The dispute marked the origin of a new discipline, the calculus of variations . 6. He mainly studied the calculus of variations , partial differential equations, and differential geometry. 7. His thesis dealt with the topic of the calculus of variations . 8. He works on partial differential equations and the calculus of variations . 9. Mason's mathematical research interests included differential equations, the calculus of variations , and electromagnetic theory. 10. He works on the calculus of variations , partial differential equations and geometric measure theory.