the following is an alphabetical list of the minor characters in the various versions of the hitchhiker's guide to the galaxy, by douglas adams.the descriptions of the characters are accompanied by information on details about appearances and references to the characters.
in mathematics, some functions or groups of functions are important enough to deserve their own names.this is a listing of articles which explain some of these functions in more detail. there is a large theory of special functions which developed out of statistics and mathematical physics.a modern, abstract point of view contrasts large function spaces, which are infinite-dimensional and .
a valveless pulsejet or pulse jet is the simplest known jet propulsion device. valveless pulsejets are low in cost, light weight, powerful and easy to operate. they have all the advantages and most of the disadvantages of conventional valved pulsejets, but without the reed valves that need frequent replacement -.
an air flow meter is a device that measures air flow, i.e. how much air is flowing through a tube. it does not measure the volume of the air passing through the tube, it measures the mass of air flowing through the device per unit time. thus air flow meters are simply an application of mass flow meters for a special medium. typically, mass air flow measurements are expressed in the units of .
sodium fluoride naf is an inorganic compound with the formula na f.it is a colorless or white solid that is readily soluble in water. it is a common source of fluoride in the production of pharmaceuticals and is used to prevent dental cavities.. in 2016 it was the 215th most prescribed medication in the united states, with more than 2 million prescriptions.
in mathematics, even functions and odd functions are functions which satisfy particular symmetry relations, with respect to taking additive inverses.they are important in many areas of mathematical analysis, especially the theory of power series and fourier series.they are named for the parity of the powers of the power functions which satisfy each condition: the function = is an even .
a paper shredder is a mechanical device used to cut paper into either strips or fine particles. government organizations, businesses, and private individuals use shredders to destroy private, confidential , or otherwise sensitive documents.
a bell-shaped function or simply 'bell curve' is a mathematical function having a characteristic 'bell'-shaped curve. these functions are typically continuous or smooth, asymptotically approach zero for large negative/positive x, and have a single, unimodal maximum at small x.
in mathematics, a continuous function is a function that does not have any abrupt changes in value, known as discontinuities. more precisely, sufficiently small changes in the input of a continuous function result in arbitrarily small changes in its output. if not continuous, a function is said to be discontinuous.
in mathematics, the term 'characteristic function' can refer to any of several distinct concepts: the indicator function of a subset, that is the function: , , which for a given subset a of x, has value 1 at points of a and 0 at points of x − a.
a cultivator is any of several types of farm implement used for secondary tillage.one sense of the name refers to frames with teeth also called shanks that pierce the soil as they are dragged through it linearly.another sense refers to machines that use rotary motion of disks or teeth to accomplish a similar result. the rotary tiller is a principal example.
in mathematical analysis, and applications in geometry, applied mathematics, engineering, natural sciences, and economics, a function of several real variables or real multivariate function is a function with more than one argument, with all arguments being real variables. this concept extends the idea of a function of a real variable to several variables.
a horizontal baffle of firebrick within the furnace, usually of a locomotive boiler. this forces combustion gases from the front of the furnace to flow further, back over the rest of the furnace, encouraging efficient combustion. the invention of the brick arch, along with the blastpipe and forced draught,.
in mathematics, three different functions are known as the pi or pi function: pi function – the prime-counting function pi function – the gamma function when offset to coincide with the factorial; rectangular function; this disambiguation page lists articles associated with the title pi function. if an internal link led you here, you may wish to change the link to point directly to the .