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In Einstein notation, the duplication on the i index implies the sum on i. The previous is then denoted εijkεimn = δjmδkn − δjnδkm.These Houses are important for understanding the conduct on the tensor in various coordinate systems.ε i j ε i n = δ j n displaystyle varepsilon _ ij varepsilon ^ in = delta _ j ^ n I verified the contraction