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Reference.org
Variational methods in general relativity
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<p>Variational methods in general relativity refers to various mathematical techniques that employ the use of <a href="/facts/Variational_calculus/Ya5Lsma3">variational calculus</a> in <a href="/facts/Albert_Einstein/CNTet8qu">Einstein</a>'s theory of <a href="/facts/General_relativity/jVsoIg8X">general relativity</a>. The most commonly used tools are <a href="/facts/Lagrangian_(field_theory)/p9BCUz57">Lagrangians</a> and <a href="/facts/Hamiltonian_mechanics/2ReerlNA">Hamiltonians</a> and are used to derive the <a href="/facts/Einstein_field_equations/j2rJTzW9">Einstein field equations</a>. </p>