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Tag Archives: Beta
Solving an integral using Dogbone contour
Prove that $$\int^{1}_{0} \sqrt{x}\sqrt{1x}\,dx = \frac{\pi}{8}$$ $$\textit{proof}$$ Consider the function $$f(z) = \sqrt{zz^2} = e^{\frac{1}{2}\log(zz^2)}$$ Consider the branch cut on the xaxis $$x(1x)\geq 0\,\, \implies \, 0\leq x \leq 1 $$ Consider \( w= zz^2 \) then $$\log(w) = \logw+i\theta,\,\, … Continue reading
Proof of beta function using convolution
Prove the following $$\beta(x, y)=\int^{1}_{0}t^{x1}\, (1t)^{y1}\,dt= \frac{\Gamma(x)\Gamma{(y)}}{\Gamma{(x+y)}}$$ $$\textit{proof}$$ Let us choose some functions $f$ and $g$ $$f(t) = t^{x} \,\, , \, g(t) = t^y$$ Hence we get $$(t^x*t^y)= \int^{t}_0 s^{x}(ts)^{y}\,ds $$ So by the convolution rule we have the … Continue reading