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Substantiivi

1. (mathematics, physics) A differential operator,denoted ∆ and defined on ${\displaystyle \mathbb {R} ^{n}}$ as ${\displaystyle \Delta =\sum _{i=1}^{n}{\frac {\partial ^{2}}{\partial x_{i}^{2}}}}$, used in the modeling of wave propagation, heat flow and many other applications.