NHoldFirst
 Usage
• NHoldFirst是一个属性值,用来指定一个函数的第一个参数不应被N影响.
Notes
 Further Examples
Usually N goes inside functions and gets applied to each of their arguments.
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Out[1]=
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This tells Mathematica not to apply N to the first argument of f.
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Now the first argument of f is left in its exact form.
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Out[3]=
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