Multi-index notation
- 多重指标（多重指标是一种方便的表示法，将单个整数推广为多个整数，可简化多元微积分、偏微分方程与分布理论计算，便于操作幂级数）
Multi-index notation
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abstract:
The mathematical notation of multi-indices simplifies formulae used in multivariable calculus, partial differential equations and the theory of distributions, by generalising the concept of an integer index to an ordered tuple of indices.
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