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  2. Squeeze theorem - Wikipedia

    en.wikipedia.org/wiki/Squeeze_theorem

    In calculus, the squeeze theorem (also known as the sandwich theorem, among other names [a]) is a theorem regarding the limit of a function that is bounded between two other functions. The squeeze theorem is used in calculus and mathematical analysis , typically to confirm the limit of a function via comparison with two other functions whose ...

  3. Small-angle approximation - Wikipedia

    en.wikipedia.org/wiki/Small-angle_approximation

    The sine and tangent small-angle approximations are used in relation to the double-slit experiment or a diffraction grating to develop simplified equations like the following, where y is the distance of a fringe from the center of maximum light intensity, m is the order of the fringe, D is the distance between the slits and projection screen ...

  4. Sinc function - Wikipedia

    en.wikipedia.org/wiki/Sinc_function

    In either case, the value at x = 0 is defined to be the limiting value ⁡:= ⁡ = for all real a ≠ 0 (the limit can be proven using the squeeze theorem). The normalization causes the definite integral of the function over the real numbers to equal 1 (whereas the same integral of the unnormalized sinc function has a value of π ).

  5. List of theorems - Wikipedia

    en.wikipedia.org/wiki/List_of_theorems

    Perfect graph theorem (graph theory) Perlis theorem (graph theory) 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

  6. List of limits - Wikipedia

    en.wikipedia.org/wiki/List_of_limits

    This is known as the squeeze theorem. [ 1 ] [ 2 ] This applies even in the cases that f ( x ) and g ( x ) take on different values at c , or are discontinuous at c . Polynomials and functions of the form x a

  7. Squeeze mapping - Wikipedia

    en.wikipedia.org/wiki/Squeeze_mapping

    A squeeze mapping moves one purple hyperbolic sector to another with the same area. It also squeezes blue and green rectangles.. In 1688, long before abstract group theory, the squeeze mapping was described by Euclid Speidell in the terms of the day: "From a Square and an infinite company of Oblongs on a Superficies, each Equal to that square, how a curve is begotten which shall have the same ...

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  9. Wirtinger's inequality for functions - Wikipedia

    en.wikipedia.org/wiki/Wirtinger's_inequality_for...

    is finite, the limit of ⁠ 1 / x ⁠ y(x) 2 as x converges to zero is zero. Since cot x < ⁠ 1 / x ⁠ for small positive values of x, it follows from the squeeze theorem that y(x) 2 cot x converges to zero as x converges to zero. In exactly the same way, it can be proved that y(x) 2 cot x converges to zero as x converges to π.