Showing posts with label MathJax. Show all posts
Showing posts with label MathJax. Show all posts

Thursday, August 22, 2019

Erik Verlinde: @Studium Generale Delft: A New View on Gravity and the Cosmos



  • Apsis
  • Aphelion
  • Perihelion 
  • 近点・遠点
  • Gravitational lensing
  • Einstein Ring
  • Detection of Gravitational Waves (from Merging Black Holes)
  • Rotation velocity of a galaxy
  • Bekenstein & Hawking's Black Hole Thought Experiments
  • Black holes emit radiation

$$S = {Area \over 4Gℏ}c^3$$
The amount of information is determined by the area of the black hole horizon.

  • EPR pair
  • It from Qubit

Wednesday, January 4, 2017

MathJax: MathML

e x = n = 0 1 n ! x n

Latex: Fractions (分数)

Shorthand (Fraction):

\frac{1}{2}


Output:

\(
\frac{1}{2}
\)


Shorthand (Fraction large):

\displaystyle
\frac{1}{2}


Output:

\(
\displaystyle
\frac{1}{2}
\)


Shorthand (Fraction and parentheses or bracket):

\left(\frac{1}{2}\right)^2


Output:

\(
\left(\frac{1}{2}\right)^2
\)


Shorthand (Continued fraction (連分数)):

\displaystyle
\frac{a + b}{c + \frac{d}{e}}


Output:

\(
\displaystyle
\frac{a + b}{c + \frac{d}{e}}
\)

Tuesday, January 3, 2017

コーシー・リーマンの関係式&コーシーの積分公式

式\eqref{eq:Cauchy-Riemann}はコーシー・リーマンの関係式です. \begin{align} &\frac{\partial u}{\partial x}=\frac{\partial v}{\partial y}& &\frac{\partial u}{\partial y}=-\frac{\partial v}{\partial x}& \tag{1} \label{eq:Cauchy-Riemann} \end{align} そして,式\eqref{eq:Cauchy-int}はコーシーの積分公式です. \begin{align} \oint_C \frac{f(z)}{z-z_0}=2\pi i f(z_0) \tag{2} \label{eq:Cauchy-int} \end{align}

ガウスの発散定理

ガウスの発散定理は, \begin{align} \int_V \nabla\cdot AdV=\int_S A\cdot n dS \tag{1} \label{eq:gauss} \end{align} です.式\eqref{eq:gauss}は,微分の体積分はものの関数の面積分になる,と言っています.

二階の反対称テンソル

二階の反対称テンソル \begin{align*} f_{\mu\lambda}= \begin{bmatrix} 0 & cB_z & -cB_y & -iE_x \\ -cB_z & 0 & cB_x & -iE_y \\ cB_y & -cB_x & 0 & -iE_z \\ iE_x & iE_y & iE_z & 0 \end{bmatrix} \end{align*} になる.

オイラーの公式

有名なオイラーの公式は,\(e^{i\theta}=\cos\theta+i\sin\theta\) です.