Calculus in the palm of your hand.
Calculus calculus, branch of mathematics that studies continuously changing quantities. The calculus is characterized by the use of infinite processes, involving passage to a limit—the notion of tending toward, or approaching, an ultimate value. in the palm of your hand
Most banquets celebrating an important anniversary feature a prominent guest speaker. But when more than 1,700 mathematicians Mathematicians by letter: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z See also
The delivery on Jan. 7 of 1,500 calculators, the first units of the HP-28S to come off the Hewlett-Packard assembly line in Corvallis, Ore., marked the dramatic debut of a calculating machine capable of handling not just numbers and simple operations such as multiplication multiplication, fundamental operation in arithmetic and algebra. Multiplication by a whole number can be interpreted as successive addition. For example, a number N multiplied by 3 is N + N + N. but also algebraic expressions One or more characters or symbols associated with algebra; for example, A+B=C or A/B. and complex tasks such as taking derivatives and plotting graphs. For example, with this compact, hand-held machine, a user can do the kinds of problems featured in beginning calculus textbooks (SN: 11/14/87, p. 317). Entering the algebraic expression "sin x," then pressing a few keys to take its derivative, displays the answer "cos x" on the calculator's four-line liquid crystal display liquid crystal display (LCD)
Optoelectronic device used in displays for watches, calculators, notebook computers, and other electronic devices. Current passed through specific portions of the liquid crystal solution causes the crystals to align, blocking the passage of light. . A few more keystrokes generate a graph of the equation.
The HP-28S and its predecessor, the HP-28C introduced last year, are the most sophisticated hand-held calculators yet produced, says mathematician John W. Kenelly of Clemson (S.C.) University. Although a few calculators can now plot graphs if coordinates of points on a curve are supplied, no others can manipulate symbols and algebraic expressions. Kenelly has been teaching an introductory calculus course in which every student uses an HP-28C regularly. The HP-28S is even faster than the original and has a larger memory that allows it to do bigger problems, especially those involving series and matrices.
"What this machine does has been available on computers for quite a while," says Kenelly. "The convenience of it is the real breakthrough. I have had a very rich year with the 28C because it's been with me on airplanes, and the airline industry has made it very easy for me to find plenty of time to play with it."
The intense curiosity and sense of novelty Novelty is the quality of being new. Although it may be said to have an objective dimension (e.g. a new style of art coming into being, such as abstract art or impressionism) it essentially exists in the subjective perceptions of individuals. with which many mathematicians at the banquet greeted the new calculator seemed a little worrisome to at least one mathematician who observed the proceedings. It showed, he said, how novel the idea of using a computer or a sophisticated calculator to assist in teaching college mathematics courses or in conducting mathematical research still is to many mathematicians.