Update 2014-07-01-gamma-function-2.md (#420)
Update 2014-07-01-gamma-function-2.md (#420)

* Update 2014-07-01-gamma-function-2.md

* Update 2014-07-01-gamma-function-2.md

修复公式间空格、积分上下标等问题

* Update 2014-07-01-gamma-function-2.md

大大们看这版，对照预览又修理了两个问题~

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