Then the present value of $1-- The present PDV or PV of $1 = $1/.

一美元的现值...,一美元的现期贴现值或者现值就等于1/

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which is f , divided by the value of the x-axis here.

斜率，而f是p趋于0时pV的极限。

麻省理工公开课 - 热力学与动力学课程节选

PV Now delta u is minus delta pV.

现在Δu=-Δ

麻省理工公开课 - 热力学与动力学课程节选