Zanaboni Theorem and Saint-Venant's Principle

Violating the law of energy conservation, Zanaboni Theorem is invalid

and Zanaboni's proof is wrong. Zanaboni's mistake of " proof " is analyzed.

Energy Theorem for Zanaboni Problem is suggested and proved.

Equations and conditions are established in this paper for Zanaboni Problem,

which are consistent with , equivalent or identical to each other. Zanaboni

Theorem is, for its invalidity , not a mathematical formulation or

proof of Saint-Venant's Principle.