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Pustam Raut's user avatar
Pustam Raut's user avatar
Pustam Raut's user avatar
Pustam Raut
  • Member for 7 years, 7 months
  • Last seen this week
About

I have been fascinated by the beauty of mathematics since my childhood.

$\color{blue}{\textbf{A lifelong philomath, STEM enthusiast, and hodophile!}}$ ⚛️🚀🌌✈️🧳

Mathematics is a fascinating and beautiful subject that does describe everything elegantly and universally, where I do not need to memorize things but can think them out myself.

$\color{purple}{\text{Some of my favourite equations:}}$

$\color{red}{\boxed{\color{blue}{\boxed{\color{blue}{\zeta(s)=\sum_{n=1}^\infty\frac{1}{n^{s}}=\prod_{p \text{ prime}} \frac{1}{1-p^{-s}}=0,\ s\in\mathbb{C}}\color{black}{\implies}\color{red}{\Re(s)=\frac12}}}}}$ $\color{green}{\texttt{True}} \texttt{ or } \color{red}{\texttt{False}}?$🤔🤯

$\color{blue}{\boxed{\operatorname{agm}(1,\sqrt{2})=\dfrac{\pi}{\varpi}=\dfrac1G=1.19814023473559220743992249\dots}}$ $\color{blue}{\texttt{Arithmetic–geometric mean (AGM) }}$

$\color{red}{\boxed{\displaystyle\lim_{n\to\infty}\sqrt[n]{\operatorname{lcm}(1,2,3,\dots,n)}=\lim_{n\to\infty}\left(\prod_{k=1}^{\pi(n)}p_k^{\left\lfloor\log_{p_k}n\right\rfloor}\right)^{\frac1n}=e=2.718281828\dots}}$ $\color{red}{\texttt{LCM of the natural numbers}}$

$\color{green}{\boxed{\displaystyle\lim_{n\to\infty}\dfrac{\beta_n\beta_{n+2}}{\beta_{n+1}^2}=e=2.718281828\dots,\ \text{where }\beta_n=\prod_{k=0}^n\binom nk}}$ $\color{green}{\texttt{Binomial coefficients in Pascal's triangle}}$

$\color{green}{\boxed{\frac {\partial}{\partial t} (\rho\,\mathbf{u}) + \nabla \cdot (\rho\,\mathbf{u} \otimes \mathbf{u}) = - \nabla p + \nabla \cdot \boldsymbol \tau + \rho\,\mathbf{f}}}$ $\color{green}{\texttt{Navier–Stokes equations (conservation form)}}$

$\color{red}{\boxed{\rho \frac{\mathrm{D} \mathbf{u}}{\mathrm{D} t} = \underbrace{\overbrace{- \nabla p}^\text{internal} + \overbrace{\nabla \cdot\left\{ \mu \left[\nabla\mathbf{u} + ( \nabla\mathbf{u} )^\mathrm{T} - \tfrac23 (\nabla\cdot\mathbf{u})\mathbf I\right] \right\}}^\text{Cauchy stress tensor term} + \overbrace{\nabla[\zeta (\nabla\cdot\mathbf{u})]}^\text{bulk viscocity term} + \overbrace{\rho\mathbf{f}}^\text{external}}_{\mathbf R}}}$ $\color{red}{\texttt{convective form}}$

$\color{blue}{\boxed{\rho \frac{\mathrm{D} \mathbf{u}}{\mathrm{D} t} = \overbrace{\rho \left(\underbrace{ \frac{\partial \mathbf{u}}{\partial t}}_\text{variation} + \underbrace{(\mathbf{u} \cdot \nabla) \mathbf{u}}_\text{convection} \right)}^\text{inertia} = \mathbf R -\overbrace{ \rho \left[\underbrace{2\mathbf\Omega\times\mathbf u}_\text{Coriolis} + \underbrace{\mathbf\Omega\times(\mathbf\Omega\times\mathbf r)}_\text{centrifugal} + \underbrace{\frac{\mathrm{d} \mathbf \Omega}{\mathrm{d} t}\times\mathbf r}_\text{Euler/angular}+ \underbrace{\frac{\mathrm{d} \mathbf U}{\mathrm{d} t}}_\text{linear}\right]}^{\text{pseudo/inertial/fictitious forces}}}}$ $\color{blue}{\texttt{non-inertial frame}}$

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