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  2. Coin problem - Wikipedia

    en.wikipedia.org/wiki/Coin_problem

    For example, the largest amount that cannot be obtained using only coins of 3 and 5 units is 7 units. The solution to this problem for a given set of coin denominations is called the Frobenius number of the set. The Frobenius number exists as long as the set of coin denominations is setwise coprime.

  3. Frobenius theorem (differential topology) - Wikipedia

    en.wikipedia.org/wiki/Frobenius_theorem...

    The Frobenius theorem asserts that this problem admits a solution locally [3] if, and only if, the operators L k satisfy a certain integrability condition known as involutivity. Specifically, they must satisfy relations of the form () = ()

  4. Frobenius method - Wikipedia

    en.wikipedia.org/wiki/Frobenius_method

    Some solutions of a differential equation having a regular singular point with indicial roots = and .. In mathematics, the method of Frobenius, named after Ferdinand Georg Frobenius, is a way to find an infinite series solution for a linear second-order ordinary differential equation of the form ″ + ′ + = with ′ and ″.

  5. Frobenius theorem - Wikipedia

    en.wikipedia.org/wiki/Frobenius_theorem

    Frobenius reciprocity theorem in group representation theory describing the reciprocity relation between restricted and induced representations on a subgroup Perron–Frobenius theorem in matrix theory concerning the eigenvalues and eigenvectors of a matrix with positive real coefficients

  6. Straightening theorem for vector fields - Wikipedia

    en.wikipedia.org/wiki/Straightening_theorem_for...

    The theorem is also known as straightening out of a vector field. The Frobenius theorem in differential geometry can be considered as a higher-dimensional generalization of this theorem. Proof

  7. Integrability conditions for differential systems - Wikipedia

    en.wikipedia.org/wiki/Integrability_conditions...

    The most famous of these are the Cartan–Kähler theorem, which only works for real analytic differential systems, and the Cartan–Kuranishi prolongation theorem. See § Further reading for details. The Newlander–Nirenberg theorem gives integrability conditions for an almost-complex structure.

  8. List of theorems - Wikipedia

    en.wikipedia.org/wiki/List_of_theorems

    Perpendicular axis theorem ; Perron–Frobenius theorem (matrix theory) Peter–Weyl theorem (representation theory) Phragmén–Lindelöf theorem (complex analysis) Picard theorem (complex analysis) Picard–Lindelöf theorem (ordinary differential equations) Pick's theorem ; Pickands–Balkema–de Haan theorem (extreme value theory)

  9. Postage stamp problem - Wikipedia

    en.wikipedia.org/wiki/Postage_stamp_problem

    The postage stamp problem (also called the Frobenius Coin Problem and the Chicken McNugget Theorem [1]) is a mathematical riddle that asks what is the smallest postage value which cannot be placed on an envelope, if the latter can hold only a limited number of stamps, and these may only have certain specified face values.