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This is the first of two theorems (see Noether's second theorem) published by the mathematician Emmy Noether in 1918. [1] The action of a physical system is the integral over time of a Lagrangian function, from which the system's behavior can be determined by the principle of least action .
Her work on differential invariants in the calculus of variations, Noether's theorem, has been called "one of the most important mathematical theorems ever proved in guiding the development of modern physics". [11] In the second epoch (1920–1926), she began work that "changed the face of [abstract] algebra". [12]
An application of the second isomorphism theorem identifies projective linear groups: for example, the group on the complex projective line starts with setting = (), the group of invertible 2 × 2 complex matrices, = (), the subgroup of determinant 1 matrices, and the normal subgroup of scalar matrices = {():}, we have = {}, where is ...
Envelope theorem (calculus of variations) Isoperimetric theorem (curves, calculus of variations) Minimax theorem (game theory) Mountain pass theorem (calculus of variations) Noether's second theorem (calculus of variations, physics) Parthasarathy's theorem (game theory) Sion's minimax theorem (game theory) Tonelli's theorem (functional analysis)
For a given genus g, the moduli space for curves C of genus g should contain a dense subset parameterizing those curves with the minimum in the way of special divisors. One goal of the theory is to 'count constants', for those curves: to predict the dimension of the space of special divisors (up to linear equivalence) of a given degree d, as a function of g, that must be present on a curve of ...
K) is a Chern number and the self-intersection number of the canonical class K, and e = c 2 is the topological Euler characteristic. It can be used to replace the term χ(0) in the Riemann–Roch theorem with topological terms; this gives the Hirzebruch–Riemann–Roch theorem for surfaces.
Emmy Noether (1882–1935), German Jewish mathematician; Herglotz–Noether theorem, in special relativity; Lasker–Noether theorem, that states that every Noetherian ring is a Lasker ring; Skolem–Noether theorem, which characterizes the automorphisms of simple rings; Albert–Brauer–Hasse–Noether theorem, in algebraic number theory
In mathematics, the Noether normalization lemma is a result of commutative algebra, introduced by Emmy Noether in 1926. [1] It states that for any field k , and any finitely generated commutative k -algebra A , there exist elements y 1 , y 2 , ..., y d in A that are algebraically independent over k and such that A is a finitely generated module ...