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ZeroTest is an option that specifies a functional test for convergence in SolveMech and many other numerical functions that use Newton's method.
ZeroTest->f assumes that convergence has been reached if the function f returns True when applied to each element of the result vector of Newton's method.

ZeroTest must be a function that returns True or False when applied to a number.
• The default setting for most functions is ZeroTest->(Abs[#]<10^-9&).
• See also: DampingFactor.