n. nabla
misc. nabla operator
... nabla calculation 倒三角算子计算 nabla operator 倒三角算子 napier's logarithm 讷代对数 ...
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这个一般读作，而不读作倒三角，或者别的，它是一个算子的符号。
Del so, this guy usually pronounced as del, rather than as pointy triangle going downwards or something like that, it's a symbolic notation for an operator.
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