 By Haskell B. Curry, Robert Feys, William Craig, A. Heyting, A. Robinson

ISBN-10: 0720422086

ISBN-13: 9780720422085

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Additional info for Combinatory Logic: Volume I

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Y, = d2, + am2x2+ ... + a n r , l ~ , dfl1. = From this system we produce another system (S’) in n - I unknowns as follows. g. , x , ~ - ~If. now to these equations we adjoin the equations of (S) in which q,,= 0, one obtains a system ( S ’ ) which is the result of eliminating x , from ( S ) . It is readily seen that if an n-tuple of elements ( x l , .. , x,) satisfies (S) then the (n - 1)-tuple ( x l , . , x f l P l )satisfies (S’), and for 38 REQUISITES FROM ALGEBRA, LOGlC A N D PROBABILITY each ( n - 1)-tuple ( x l , .

Ab = a . by a - b = a ( - b ) , -ab = -(ab), etc. 42. In a non-trivial commutative ring with unit, the following hold: 1 f0, la=al =a, + b = b -+ a, u + (b + = + b) + a + 0 = a, a + x = 0 has a unique solution x = - a , u (U C) ab = bay a . 0 = 0 . a = 0, u(b a(-b) u(bc) = (ab) c, = (-a) + c) = ab + ac, a m . an = a m i n , ma C, + na = (m + n)a, b = -(ab) a(b - c) = ab - = -ab, ac. (arn)”= amn, n(ma) = (nm)a, for all integers m and n. 3. Certain substructures of rings called “ideals” are of considerable interest.

Xn) satisfies (S). As with systems of linear equations this Fourier elimination procedure LINEAR PROGRAMMING 39 can be made the basis for a method of solving systems of linear inequations of the type (S). The method is easily extended to the case of a system containing also linear equations as well as strict inequations. Here we omit strict inequations from consideration as they d o not enter into our particular application to Boole's work. However equations are easily encompassed in the treatment of non-strict inequations, for any equation of the form L = 0 is equivalent to the pair of inequations L 2 0, -L 2 0.