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; Loading