Hello-World

Learning how to use GitHub.

Math support

$$\frac{1}{\sqrt{k}} = \frac{2}{2\sqrt{k}}<\frac{2}{\sqrt{k}+\sqrt{k-1}} = 2 (\sqrt{k}-\sqrt{k-1})$$

Mermaid diagram

  graph TD;
      A-->B;
      A-->C;
      B-->D;
      C-->D;

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