By W.H.J. Feijen, A.J.M. van Gasteren, David Gries, J. Misra

More than anything, this booklet is a tribute to Edsger W. Dijkstra, at the social gathering of his 60th birthday, via quite a few of these lucky adequate to be encouraged through him and his paintings and to be known as his buddy or relation, his grasp, colleague, or scholar. This e-book comprises fifty-four technical contributions in numerous parts of undertaking, even if lots of them take care of a space of specific trouble to Dijkstra: programming. every one contribution is comparatively brief and will be digested in a single sitting. jointly, they shape a pleasant move component of the self-discipline of programming first and foremost of the nineties. whereas many be aware of of Dijkstra's technical contributions, they might not pay attention to his final objective, the mastery of complexity in arithmetic and computing technological know-how. He has forcefully argued that good looks and style are necessary to this mastery. The identify of this publication, selected to mirror his final aim, comes from a sentence in an editorial of his on a few appealing arguments utilizing mathematical induction: *"... once we **recognize the conflict opposed to chaos, mess, and unmastered **complexity as one among computing sci*- *ence's significant callings, **we needs to admit that 'Beauty Is Our Business'.*"

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**Extra info for Beauty Is Our Business: A Birthday Salute to Edsger W. Dijkstra**

**Example text**

The second specification is shorte r than the first but uses more machinery. However, it has the advantage that sufficient theory is known about partition s for a solution as a left reduction to be dedu ced immedia tely. This is gone into below. Third specification In th e third specification, suggested to me by Carroll Morgan , we formalise th e idea that the required sequence is the "earliest" decreasing subsequence. For t his we need a suitable ordering on sequences of indices. The usual lexicographic ordering is almost what is want ed, except t hat we must reverse th e standard conventi on t hat initial segments of a sequence precede the sequence itself.

From (9) and (11) we have "+1 = F4j = F2j*E2j, Fk FH I - 1 = F4j+1 - 1 = F2j*E2j+1 ' Thus, F2j is a common factor and , since E 2j and E 2j+1 are relatively prime, F2j = Fk / 2 is the gcd of Fk and Fk+ 1 - 1. Thus, we have proved the first half of (7). Assuming i = 2j + 1, the second half follows in a similar manner, using (9) and (10). o Substituting the values of f( k) as given in (7) into definition (6) of

One straightforward specification, using just the predicate calculus, can be given in the following way. Let x(O :S i < N) be the given sequence. Required is the subsequence of x with indices 4>(0 :S i < n), where 4> : int ........ int satisfies the conditions: (i) (boundary conditions) 4>(0) =0 and 4>(n) =N (ii) (solution is a subsequence) (Vi, j : 0 :S i < j < n: O:S 4>( i) < 4>(j) < N) (iii) (solution is decreasing) (Vi ,j : 0 :S i < j < n: x(4)(i)) > x(4)(j))) (iv) (solution is left-minimal) (Vj: O:S j < n : (Vk: 4>(j) :S k < 4>(j + 1) : x(4)(j)) :S x(k))) The first two conditions say that what is wanted is a subsequence of x beginning with the first element of x.