Question: Give an example to show that if R and S are both n-ary relations, then Pi1,i2,...,im(R S) may be different from Pi1,i2,...,im(R) Pi1,i2,...,im(S).

Give an example to show that if R and S are both n-ary relations, then Pi1,i2,...,im(R − S) may be different from Pi1,i2,...,im(R) − Pi1,i2,...,im(S).

Step by Step Solution

★★★★★

3.46 Rating (162 Votes )

There are 3 Steps involved in it

1 Expert Approved Answer

Step: 1 Unlock

Note that we lose information when we delete columns Therefore we might be taking ... View full answer

Question Has Been Solved by an Expert!

Get step-by-step solutions from verified subject matter experts

Step: 2 Unlock

Step: 3 Unlock

Document Format (1 attachment)

923-M-C-M-S (2196).docx

120 KBs Word File

Students Have Also Explored These Related Statistics Questions!

(a) If an is absolutely convergent and (bn) is a bounded sequence, show that anbn is absolutely convergent. (b) Give an example to show that if the convergence of an is conditional and (bn) is a...

(a) Give an example to show that if A and B are symmetric n n matrices, then AB need not be symmetric. (b) Prove that if A and B are symmetric n n matrices, then AB is symmetric if and only if AB =...

(a) Give an example to show that if A can be partitioned as where P, Q, R, and S are all square, then it is not necessarily true that det A = (det P) (det S) - (det Q) (det R) (b) Assume that A is...

Please program in java Program-2 DFA State Minimization Backgrounds Deterministic State Acceptors play many important roles in computing applications such as compiler design and regular language...

\fCOMPLEX VARIABLES AND APPLICATIONS Eighth Edition James Ward Brown Professor of Mathematics The University of Michigan-Dearborn Ruel V. Churchill Late Professor of Mathematics The University of...

I am struggling to do the proper computations for some simple accounting. After i get this down, i will produce a paper on the importance of each number i solved for. Can someone please help me...

Journal of Case Studies in Education Elementary teachers' experiences and perceptions of departmentalized instruction: A case study Alecia Strohl Valdosta State University Lorraine Schmertzing...

.QUESTION .all the questions to be thoroughly explained Invocations of its type operations involve no writes to persistent memory and no output to clients. Concurrent processes may invoke the object....

According to the Residential Tenancies Act in place in NovaScotia, residents who have been renting premises for more than fiveyears have security of tenure, which means that they can be givennotice...

a. Use the current level of EBIT to calculate the times interest earned ratio for each capital structure. Evaluate the current and two alternative capital structures using the times interest earned...

20. Research and development activities may include (a) personnel costs, (b) materials and equipment costs, and (c) indirect costs. What is the recommended accounting treatment for these three types...

If the price of a textbook rises and then students purchase fewer textbooks, an economic model can show a cause-and-effect relationship only if which of the following conditions hold: a. students...

(a) Write an equation that defines the exponential function with base a > 0. (b) What is the domain of this function? (c) If a 1, what is the range of this function? (d) Sketch the general shape of...

(a) How is the number defined? (b) What is an approximate value for e? (c) What is the natural exponential function?

Graph the given functions on a common screen. How are these graphs related?

8. Assume a $1.000 face value bond has a coupon rate of 6 percent, pays interest semi-annually, and has an eight-year life. If investors are willing to accept a 8 percent rate of return on bonds of...

In exchange for a $400 million fixed commitment line of credit, your firm has agreed to do the following: Pay 1.83 percent per quarter on any funds actually borrowed. Maintain a 3 percent...

You plan to purchase a $150,000 house using a 30-year mortgage obtained from your local credit union. The mortgage rate offered to you is 5.75 percent. You will make a down payment of 20 percent of...