Title 23, Chapter 2, Section 21
(a) A mistake relievable in equity is some unintentional act,
omission, or error arising from ignorance, surprise, imposition, or
(b) Mistakes may be either of law or of fact.
(c) The power to relieve mistakes shall be exercised with caution;
to justify it, the evidence shall be clear, unequivocal, and
decisive as to the mistake.