Infinity on High with a 54% decline during a post-Grammy week. The album rose to number three in its third week with 79,000 units sold. In its fourth week, the disc slipped to number four and sold 67,000 copies. "Infinity on High"s sales again fell in its fifth week, moving 58,000 copies and descending to number eight on the chart. In its sixth and last week in the top ten it fell to number nine and sold 43,000 copies. In April 2007, the album was certified Platinum by the Recording Industry Association of America (RIAA), denoting the shipment of one million copies. It
Infinity symbol notation for summations and limits such as the infinity sign is conventionally interpreted as meaning that the variable grows arbitrarily large (towards infinity) rather than actually taking an infinite value. The infinity symbol may also be used to represent a point at infinity, especially when there is only one such point under consideration. This usage includes, for instance, the infinite point of a projective line, and the point added to a topological space formula_2 to form its one-point compactification formula_3. In areas other than mathematics, the infinity symbol may take on other related meanings; for instance, it has been used