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2Â¥: Originally posted by piaodongdeyu at 2013-08-11 21:25:15
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This is true and quite obvious. Left hand side subtracts the right hand side, you get \alpha_2(...)+\beta_2-\beta_1.

You can easily figure out (...) is nonnegative. Done.
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6Â¥: Originally posted by nandehutu9327 at 2013-08-12 11:03:10
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