Discrete Structures

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[math] x^21 \ne x^{21} :\delta :\epsilon :\varepsilon : \zeta : \eta :\theta :\sigma : \varsigma : \tau : \upsilon : \phi :\varphi : \chi : \psi : \omega : \Gamma : \Delta : \Theta :\Lambda [/math]

[math]\frac{x^n-1}{x-1} = \sum_{k=0}^{n-1}x^k[/math]


[math] \frac {\overbrace{(m+n)}^mbox(m )\cdots} {\underbrace{(m-1)}} \frac{(m+n)!}{m!n!} [/math]