Kronecker delta
柯林斯词典
1. N a function of two variables, i and j, that has a value of zero unless i = j, when it has a value of unity 克罗内克符号 ( symbol: δ)[maths]
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1. N a function of two variables, i and j, that has a value of zero unless i = j, when it has a value of unity 克罗内克符号 ( symbol: δ)[maths]