Hamilton, Sir William Rowan (1805-1865) - http://www.maths.tcd.ie/pub/HistMath/People/Hamilton/ Responsible for Hamilton's Principle and the classical Hamiltonian
Lagrange, Joseph Louis - http://www-groups.dcs.st-and.ac.uk/~history/Mathematicians/Lagrange.html A biography written with reference to his peers; includes quotations and references to his works.
d'Alembert - Jean Le Rond d'Alembert (1717-1783) - http://www-groups.dcs.st-and.ac.uk/~history/Mathematicians/D'Alembert.html Helped to resolve the controversy in mathematical physics over the conservation of kinetic energy by improving Newton's definition of force. A biography with references to his work and contemporaries, as well as affiliated organisations.
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