EBK CONCEPTS OF PROGRAMMING LANGUAGES
EBK CONCEPTS OF PROGRAMMING LANGUAGES
12th Edition
ISBN: 9780135102251
Author: Sebesta
Publisher: VST
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Chapter 3, Problem 16RQ

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Syntactic and semantic domains in denotational semantics:

Denotational semantics is related to definition of a mathematical object and a function that is used to map he instances of language entity (variables) onto instances of mathematical object. As the objects in mathematics are speedily defined, so they are closely related and model the exact meaning of their corresponding entities.

Manipulating mathematical objects and model is easier than making changes in the programming language model constructs...

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Subject: Database management system Explain in easy way with write  handwritten note a. What is lossy decomposition? Check whether the following decompositions are lossy or lossless. (i) Let R=ABCD, R1 = AD, R2 = AB, R3 = BE, R4 = CDE, R5 = AE, F={ A->C, B- >C, C->D, DE->C, CE->A} (ii) R (XYZWQ), FD= {X->Z, Y->Z, Z->W, WQ->Z, ZQ-> X, R1 (XW), R2 (XY), R3 (YQ) , R4 (ZWQ), R5 (XQ) b. Eliminate redundant FDs from (i) F={X->Y, Y->X, Y->Z, Z->Y, X->Z, Z->X} (ii) F = {X->YZ, ZW->P, P->Z, W->XPQ, XYQ, YW, WQ ->YZ}
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