سخت ترین سوال ریاضی جهان $\zeta(s) = \sum_{n=1}^{\infty} \frac{1}{n^s} = \frac{1}{1^s} + \frac{1}{2^s} + \frac{1}{3^s} + \dots$ $\rho C_p [\frac{\partial T}{\partial x_j}] = \frac{\partial}{\partial x_j} [k \frac{\partial T}{\partial x_j}] - \tau_{ij} \frac{\partial u_i}{\partial x_j}, \tau_{ij} = \mu (\frac{\partial u_i}{\partial x_j} + \frac{\partial u_j}{\partial x_i})$ $\frac{\partial V}{\partial t} + (v. \nabla) V = -\frac{1}{\rho} \nabla p + \upsilon \Delta V + f(x,t)$ $F(x) = f_1 f_2, \dots f_n, n \geq 2$ $F = \omega_0 + \sum_{i=1}^{n} \omega_i x_i + \sum_{i=1}^{n} \sum_{j=1}^{n} \omega_{ij} x_i x_j + \dots, F(x) = min \sum_{i=0}^{n} \omega_i f_i(x)$