The Council of Heads of State of the Shanghai Cooperation Organization adopted on Tuesday a declaration on enhancing multilateral partnership for nuclear safety and security.

Four classic results from real analysis appear here side by side. The Gaussian ∫₋∞⁺∞ e⁻ˣ² dx = √π The arctangent ∫₋∞⁺∞ 1/(x²+1) dx = π Dirichlet’s ∫₋∞⁺∞ (sin x)/x dx = π And ∫₋∞⁺∞ cos(x)/(1+x²) dx = π/e Digital audio codecs rely on the sinc integral to enforce the Nyquist rate that prevents aliasing in compressed music files.