one fable-low hijack cell
pair Gradient / Vector
envelope en_arrow
ordering BA
effort low
English with arrow '→' — '{X} → {Y}'
verdictpicked Vector (second-offered)
· classifierB
· tiernone
response (200 chars)
# Gradient → Vector
The **gradient** takes a **scalar field** and produces a **vector field**.
## Definition
For a scalar function f(x, y, z), the gradient is:
$$\nabla f = \left( \frac{\partial f
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