In mathematics, a uniqueness theorem is a theorem proving that certain conditions determine a unique solution. Examples of uniqueness theorems include:
- Alexandrov's uniqueness theorem of three-dimensional polyhedra
- Black hole uniqueness theorem
- Cauchy–Kowalevski theorem is the main local existence and uniqueness theorem for analytic partial differential equations associated with Cauchy initial value problems.
- Cauchy–Kowalevski–Kashiwara theorem is a wide generalization of the Cauchy–Kowalevski theorem for systems of linear partial differential equations with analytic coefficients.
- Fundamental theorem of arithmetic, the uniqueness of prime factorization.
- Holmgren's uniqueness theorem for linear partial differential equations with real analytic coefficients.
- Picard–Lindelöf theorem, the uniqueness of solutions to first-order differential equations.
- Thompson uniqueness theorem in finite group theory
- Uniqueness theorem for Poisson's equation
- Electromagnetism uniqueness theorem for the solution of Maxwell's equation
- Uniqueness case in finite group theory
A theorem, also called a unicity theorem, stating the uniqueness of a mathematical object, which usually means that there is only one object fulfilling given properties, or that all objects of a given class are equivalent (i.e., they can be represented by the same model). This is often expressed by saying that the object is uniquely determined by a certain set of data. The word unique is sometimes replaced by essentially unique, whenever one wants to stress that the uniqueness is only referred to the underlying structure, whereas the form may vary in all ways that do not affect the mathematical content.
A uniqueness theorem / proof is, at least within mathematics of differential equations, often combined with an existence theorem / proof to a combined existence and uniqueness theorem.
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