{\displaystyle \int _{a}^{b}\!f(x)\,dx=F(b)-F(a).} The principles of integration were formulated independently by Isaac Newton and Gottfried Leibniz in the late 17th century, who thought of the integral as an infinite sum of rectangles of infinitesimal width.
amendment - a statement that is added to or revises or improves a proposal or document (a bill or constitution etc.) statement - a message that is stated or declared; a communication (oral or written) setting forth particulars or facts etc; according to his statement he was in London on that day.
An addendum is always a part of the contract. Amendment. Amendment is a correction of an error in a document pointed out by the buyer or seller in the case of a real estate contract. An amendment may be because of a legal provision or it may be because of a factual error in the document. Typing errors are also corrected by introducing amendments in documents.