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$$x = {-b \pm \sqrt{b^2-4ac} \over 2a}.$$
$$ \prod_{j\ge0} \left(\sum_{k\ge0} a_{jk}z^k\right) = \sum_{n\ge0} z^n \left(\sum_{k_0,k_1,\ldots\ge0\atop k_0+k_1+\cdots=n} a_{0k_0}a_{1k_1} \cdots \right)$$
$$ W_{\delta_1\rho_1\sigma_2}^{3\beta} = U_{\delta_1\rho_1\sigma_2}^{3\beta} + {1\over 8\pi^2} \int_{\alpha_1}^{\alpha_2} d\alpha_2^\prime \left[ {U_{\delta_1\rho_1}^{2\beta} - \alpha_2^\prime U_{\rho_1\sigma_2}^{1\beta} \over U_{\rho_1\sigma_2}^{0\beta}} \right] $$
$$ d\Gamma = {1\over 2m_A} \left( \prod_f {d^3p_f\over (2\pi)^3} {1\over 2E_f} \right) \left| \mathscr{M} \left(m_A - \left\{p_f\right\} \right) \right|^2 (2\pi)^4 \delta^{(4)} \left(p_A - \sum p_f \right) $$
$$ p(n) = {1\over\pi\sqrt{2}} \sum_{k = 1}^\infty \sqrt{k} A_k(n) {d\over dn} {\sinh \left\{ {\pi\over k} \sqrt{2\over 3} \sqrt{n - {1\over 24}} \right\} \over \sqrt{n - {1\over 24}}} $$
$$ {(\ell+1)C_{\ell}^{TE} \over 2\pi} $$
$$ \mathbb{N} \subset \mathbb{R} $$
$$ (\sqrt{1/2})S^1 \times (\sqrt{1/2})S^1 = { \sqrt{1/2}( \cos{\theta}, \sin{\theta}, \cos{\phi}, \sin{\phi} ) , | , 0 \leq \theta < 2\pi, 0 \leq \phi < 2\pi }. $$
$$ (\sqrt{1/2})S^1 \times (\sqrt{1/2})S^1 = { \sqrt{1/2} ( e^{i\theta}, e^{i\phi} ) , | , 0 \leq \theta < 2\pi, 0 \leq \phi < 2\pi }. $$