… and expression complexity of logical langnages - relational … quantification - and algebraic
languages - relational algebra and its … Number of quantifier is better than number of tape cells. …

… For any arithmetic expression we care to write down it leaves us the task of putting in enough
parentheses to ensure it has been built-up in a unique way. It is helpful to think of abstract …

… The primary intent is to improve the functionality of relational … erators, operates on a relational
expression and produces as … relational operators can operate on it as they would on any …

… expression analysis and redundancy elimination transformation may be justified by translation
into relational … For example, a better formulation of one of the skip rules is the following: …

… Query languages whi,:h are as expressive as Codd's Rclation,d Calcul,as are somctimes
cal/cd comp]_e~. This lcrm is misleading, however, hccausc many interesting queries are not …

… Thus, the coupling of relational calculus with arithmetic constraints enhances power. A
natural question arises, attracting much attention recently: How much more power can we gain …

… A test case that forces the expression c to evaluate to `\n' and n evaluate to any value not
equal to 1, is su cient to kill such a mutant. On the contrary, an SSWM mutant will encourage the …

… expressions using the relational operations select, project, join… and show that every relational
expression over select, project, … In this section we strengthen this result by showing that the …

… and the operators are the relational operators select, project, … correspond to any expression
over the operators we discuss. … Therefore, we may “promote” b and d to the same constant, …

… for an expression is different for different occurrences of the expression in a given program.
… In a later chapter, we expand our horizons to admit the possibility that there are variables in …