The ryan plan is a "reductio ad absurdum " a disproof by taking a proposition to a logical conclusion.

瑞恩计划是一个“归谬证法”——通过推导逻辑结论对命题进行反证。

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This paper suggests that the negative proposition, as a unique form of thinking, has its important logical function and cognitive value.

本文认为否定命题作为一种独特的思维形式，有着重要的逻辑功能和认识价值。

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On the process of solving and proving mathematical proposition, using logical thought ability exactly will make steps strict and ordered.

在解决、论证数学命题过程中，准确使用逻辑思维方法，可使具体解题步骤严谨周密，条理清晰，形成完整的推理体。

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As much as I might want to be sympathetic to this claim (I fly a lot and am wary of the "security theater" at American airports), it ought not to be very convincing as a logical proposition.

WSJ: Best of the Web Today: The Belle Curve

And that proposition is more deeply logical than it seems at first blush.

FORBES: If Life is a Game, Let The Web Be Its Stage (Sorry Shakespeare)