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→Introduction 引言
f}{\partial y}+z\frac{\partial f}{\partial z}+\cdots \equiv nf.
f}{\partial y}+z\frac{\partial f}{\partial z}+\cdots \equiv nf.
</math>
</math>
{{NumBlk|:|<math>x\frac{\partial f}{\partial x}+y\frac{\partial
如果<math>f (x, y, z, \ldots)</math>对<math>x, y, z, \ldots</math>是<math>n</math>次齐次的，则它满足欧拉定理：{{NumBlk|:|<math>x\frac{\partial f}{\partial x}+y\frac{\partial
f}{\partial y}+z\frac{\partial f}{\partial z}+\cdots \equiv nf.</math>|{{EquationRef|3}}}}
f}{\partial y}+z\frac{\partial f}{\partial z}+\cdots \equiv nf.</math>|{{EquationRef|3}}}}
In [[thermodynamics]], if the scale of a system is merely
In [[thermodynamics]], if the scale of a system is merely