Unlike the implied warranty of merchantability, the implied warranty of fitness does not contain a requirement that the seller be a merchant with respect to the goods sold. It merely requires that the seller possess knowledge and expertise on which the buyer may rely.
The symbol used by mathematicians to represent the ratio of a circle's circumference to its diameter is the lowercase Greek letter Ï, sometimes spelled out as pi. In English, Ï is pronounced as pie (/paÉª/ , paÉª).
To invert a number in arithmetic usually means to take its reciprocal. A closely related idea in geometry is that of inverting a point. In the plane, the inverse of a point P with respect to a reference circle (Ã¸) with center O and radius r is a point P', lying on the ray from O through P such that. This is called circle inversion or plane inversion.