In page 109, formula 6.13, function f has m dimensions,
In page 110, formula 6.15, I suppose function f should only have 1 dimension, considering H is only valid for a scalar value function.
To avoid confusion, I suggest explicitly state f is a scalar function in 6.15.
In page 109, formula 6.13, function f has m dimensions, In page 110, formula 6.15, I suppose function f should only have 1 dimension, considering H is only valid for a scalar value function. To avoid confusion, I suggest explicitly state f is a scalar function in 6.15.