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  2. List of trigonometric identities - Wikipedia

    en.wikipedia.org/wiki/List_of_trigonometric...

    In particular, in these two identities an asymmetry appears that is not seen in the case of sums of finitely many angles: in each product, there are only finitely many sine factors but there are cofinitely many cosine factors. Terms with infinitely many sine factors would necessarily be equal to zero. When only finitely many of the angles are ...

  3. List of open-source software for mathematics - Wikipedia

    en.wikipedia.org/wiki/List_of_open-source...

    The precise uses and capabilities of these systems differ greatly from one system to another, yet their purpose remains the same: manipulation of symbolic equations. Computer algebra systems often include facilities for graphing equations and provide a programming language for the users' own procedures.

  4. Hadamard factorization theorem - Wikipedia

    en.wikipedia.org/wiki/Hadamard_factorization_theorem

    Otherwise, has infinitely many roots. This is the tricky part and requires splitting into two cases. This is the tricky part and requires splitting into two cases. First show that g ≤ floor ( ρ ) {\displaystyle g\leq {\text{floor}}(\rho )} , then show that ρ ≤ g + 1 {\displaystyle \rho \leq g+1} .

  5. 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 ...

  6. Euler's formula - Wikipedia

    en.wikipedia.org/wiki/Euler's_formula

    Many texts write φ = tan −1 ⁠ y / x ⁠ instead of φ = atan2(y, x), but the first equation needs adjustment when x ≤ 0. This is because for any real x and y, not both zero, the angles of the vectors (x, y) and (−x, −y) differ by π radians, but have the identical value of tan φ = ⁠ y / x ⁠.

  7. Euclid's theorem - Wikipedia

    en.wikipedia.org/wiki/Euclid's_theorem

    If q is not prime, then some prime factor p divides q. If this factor p were in our list, then it would also divide P (since P is the product of every number in the list). If p divides P and q, then p must also divide the difference [3] of the two numbers, which is (P + 1) − P or just 1.

  8. Fermat number - Wikipedia

    en.wikipedia.org/wiki/Fermat_number

    Are there infinitely many composite Fermat numbers? Does a Fermat number exist that is not square-free ? As of 2024 [update] , it is known that F n is composite for 5 ≤ n ≤ 32 , although of these, complete factorizations of F n are known only for 0 ≤ n ≤ 11 , and there are no known prime factors for n = 20 and n = 24 . [ 5 ]

  9. Dedekind domain - Wikipedia

    en.wikipedia.org/wiki/Dedekind_domain

    In fact, although Gauss also conjectured that there are infinitely many primes such that the ring of integers of () is a PID, it is not yet known whether there are infinitely many number fields (of arbitrary degree) such that is a PID. On the other hand, the ring of integers in a number field is always a Dedekind domain.