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Properties of Gradient Fields. Theorem 5.8 (page 354 in Lovrić). Properties of a Gradient Vector Field---Part I. Let F be a C 1 vector field defined on an open, connected set U 2 or ( 3 ) . The following statements are equivalent: F is a gradient vector field; F = f.
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Properties of Gradient Fields Theorem 5.8 (page 354 in Lovrić)
Properties of a Gradient Vector Field---Part I • Let F be a C1 vector field defined on an open, connected set U 2 or (3) . The following statements are equivalent: • F is a gradient vector field; F=f. • For any oriented, simple closed curve c, • F is path-independent: for any two oriented, simple curves c1 and c2 having the same initial an terminal points.
Properties of a Gradient Vector Field---Part II • Let F be a C1 vector field defined on an open, connected set U 2 or (3) . • F=f. • Integral of F around any oriented, simple closed curve c is 0. • F is path-independent. • Each of (a), (b), and (c) imply • Scalar curl of F is 0 (or curlF = 0 if U 3) . • If, in addition, U is simply connected all are equivalent.