Computer Algebra Handbook: Foundations, Applications, by Johannes Grabmeier, Erich Kaltofen, Volker Weispfenning, M.

By Johannes Grabmeier, Erich Kaltofen, Volker Weispfenning, M. Hitz

This ebook provides the elemental thoughts and algorithms of laptop algebra utilizing useful examples that illustrate their real use in symbolic computation. a variety of subject matters are provided, together with: Groebner bases, genuine algebraic geometry, lie algebras, factorization of polynomials, integer programming, permutation teams, differential equations, coding conception, computerized theorem proving, and polyhedral geometry. This ebook is a needs to learn for someone operating within the quarter of computing device algebra, symbolic computation, and laptop technological know-how.

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Extra resources for Computer Algebra Handbook: Foundations, Applications, Systems

Example text

Ype: :Complex - complex numbers ype:: Even - even integers Type:: Function -[unctions ype:: Imaginary - complex numbers with real part equal 0 Type:: Integer - integer nUlI/ber. ,t,;. ,;s'--_ : _ _ _ _ _ _ _ _ _ _ _--' MuPAD Computing Essentials 36 ype::Negative - negative real number Type:: NonNeglnt - non-negative integers (~O) Type:: NonNegRat - lIoll-negative ralionalnumbel's (~) Type:: NonNegative - non-negative real numbers (~) Type:: NonZero - complex numbers without 0 Type: :Odd - odd integers ype:: Poslnt - positive integers (>0) Type:: PosRat - positive rationalllumbers (>0) ype: : Positive - positive real numbers (>0) ype:: Rational - rational numbers You can also use open and closed intervals with numbers from a given type: Type::lnterval(a, b, givell_type) = {x E given_type I a < x < b} Type::lnterval([a], b, given_type) = {x E givell_type I (l :5 x < b} Type::lnterval(a, [b], given_type) = {x E givell_type I a < x 5 b} Ty e::lnterval([a]' [b], given_type = {x E given type I a :5 x:5 b} Here is shown an example of a variable that represents any prime number bigger than 2 and less than 100 • myvar:=Type::lnterval(2,lOO,Type: :Prime) [3,99] ofType::Prime In order to obtain information about all domains predefined in MuPAD you must issue this command: • info(Type) Finally, sometimes you may need information about the type of a given variable.

But not 2x, 32myf. Writing programs in MuPAD does not differ too much from writing programs in other languages. There are some good programmers' rules regarding creation of names in programs. ~--------------------~ Rule 2 Constant names are UPPERCASE, with an occasional UNDER_SCORE, ariables names are always in lowercase. 3 Writing Formulae in MuPAD Up to now you have only seen a very limited set of MuPAD arithmetical operations: +, -, *, /, A. MuPAD knows a number of functions used in Mathematics.

In order to do this we shall place another instruction inside of the fo r loop: if ... then break; It may look like in this example: a := 0: for i from 1 to 100 do a := a+i; if a>1500 then print(i), break end_if end_for; I guess now you would like to practice a bit with the for loop. You can take a break in the reading of this text now, and do a few exercises enclosed at the end of this chapter. 3 The "while" and "repeat" Loops In the situation where the number of iterations depends rather on logical condition than on the number of steps to be performed we can apply two different kinds of loops - the while loop and the repeat loop.

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