Download e-book for kindle: Algebraic K-Theory. Proc. conf. Evanston, 1980 by Eric Friedlander, M. R. Stein

By Eric Friedlander, M. R. Stein

ISBN-10: 3540106987

ISBN-13: 9783540106982

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Extra resources for Algebraic K-Theory. Proc. conf. Evanston, 1980

Example text

Xn ). Accordingly we define n-ary tuples x1 , . . , xn as nested binary pairs . . x1 , x2 , . . , xn . Furthermore we define A Relation Algebraic Semantics for a Lazy Functional Logic Language Expressions E ::= | | | | | | | | | | E * E E / E E ? E id fork unit unknown fst snd s invc 43 {sequential composition} {parallel composition} {non-deterministic choice} {identity} {sharing} {discarding} {free variable} {select first term in tuple} {select second term in tuple} {s ∈ Σ, operator or constructor} {c ∈ cons(Σ), inverted constructor} Fig.

As we will see later, we can use block-preserving permutation relations to create isomorphic solutions from a given solution of our timetabling problem. This specific kind of permutation relations is introduced as follows. 2. 1, we call a permutation relation P : G ↔ G block-preserving if B ⊆ P BP T . In words the inclusion B ⊆ P BP T means that if two groups belong to the same block, then this holds for their images under the permutation relation, too. The following theorem clarifies the relationship between isomorphism of solutions and block-preserving permutation relations.

The lazy setting requires to introduce partial values. 1, all values are constructor terms. Partial values contain the special constructor U. Thus, the set of partial values is P V := Tcons(Σ)∪{U} (X ). In order to model the construction of values we make use of the relation algebraic concept of generalized direct sums and their associated injection ιn,k as well as direct products and their associated projections π, ρ. , a bijective mapping from cons(Σ) ∪ {U} to {1, . . , |cons(Σ) ∪ {U}|}.

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Algebraic K-Theory. Proc. conf. Evanston, 1980 by Eric Friedlander, M. R. Stein


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