one fable-low hijack cell
pair Gradient / Vector
envelope code_pipe_pipe
ordering AB
effort low
Code-flavored OR operator — '{X} || {Y}'
verdictpicked Vector (second-offered)
· classifierB
· tiernone
response (200 chars)
# Vector ∥ Gradient (Vector Parallel to the Gradient)
## Key Idea
The **gradient** of a scalar function f(x, y, z) is itself a vector:
$$\nabla f = \left(\frac{\partial f}{\partial x},\ \frac{\parti
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