Weierstrass Factorization Theorem and Its Applications (ongoing)
A transcendental function which has infinite numbers of zero can be written in a form of infinite products of linear polynomials.
 
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A transcendental function which has infinite numbers of zero can be written in a form of infinite products of linear polynomials.
An useful ordinary differenctial equation
The Bessel function can be expressed not only in an infinite series form, but also in an integral form.
The most powerful tool when obtaining an asymptotic approximation of a real-valued function
PIMC gives the diagonal element of density matrix of quantum harmonic oscillator in approximate level.
Power of numerical simulation