Question: Let x be a schema. Show that ( a ) x is equivalent to the disjunction of x with any unsatisfiable schema.

Let x be a schema. Show that
(a)x is equivalent to the disjunction of x with any
unsatisfiable schema.
Let x be a schema. Show that (a)x is equivalent to

Step by Step Solution

There are 3 Steps involved in it

1 Expert Approved Answer
Step: 1 Unlock blur-text-image
Question Has Been Solved by an Expert!

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

Step: 2 Unlock
Step: 3 Unlock

Students Have Also Explored These Related Databases Questions!

Q:

Let U have a uniform distribution on the interval [0, 1]. Then observed values having this distribution can be obtained from a computer's random number generator. Let X = - (1 / )ln(1 - U). a. Show...

Q:

Show work/explanation where indicated. Answers without any work may earn little, if any, credit. You may type or write your work in your copy of the exam, or if you prefer, create a document...

Q:

"Fortran, Algol and Lisp invented most programming language concepts 50 years ago; adding the concept of object-orientation suffices to explain all programming languages to date". To what extent is...

Q:

MUST BE CORRECT ANSWERS A small software company has the following simplified cashflow, funded by shareholders' equity of 20,000 and a bank overdraft of 5000: Invoiced money received 2 months after...

Q:

\fsh is ar stu ed d vi y re aC s o ou urc rs e eH w er as o. co m Math 280 Strategies of Proof Fall 2007 Class Notes 3.6 Proving Conditional Statements II: Indirect Proofs In Section 3.4, we studied...

Q:

re Regular Languages and Finite Automata (a) Let L be the set of all strings over the alphabet {a, b} that end in a and do not contain the substring bb. Describe a deterministic finite automaton...

Q:

Briefly describe ASCII and Unicode and draw attention to any relationship between them. [3 marks] (b) Briefly explain what a Reader is in the context of reading characters from data. [3 marks] A...

Q:

XYZ What is the difference between volatile and nonvolatile memory? Is RAM volatile or nonvolatile? Is ROM volatile or nonvolatile? 7.9 Registers perform a very important role in the fetch-execute...

Q:

Portray in words what transforms you would have to make to your execution to some degree (a) to accomplish this and remark on the benefits and detriments of this thought.You are approached to compose...

Q:

Suppose that R(A, B, C) is a relational schema with functional dependencies F = {A, B C, C B}. (i) Is this schema in 3NF? Explain. [2 marks] (ii) Is this schema in BCNF? Explain. [2 marks] (b)...

Q:

Layout the cybersecurity plan of the Pureland wastewater

Q:

Oppton plc's managers are ambitious and wish to expand their range of activities. They have produced a report for the parent company's board of directors detailing five projects requiring large...

Q:

E2.14 (LO 4, 5) (Closing Entries) Presented below is information related to Russell AG for the month of January 2025. Cost of goods sold 202,000 Salaries and wages expense 61,000 Delivery expense...

Q:

River Co. began the accounting period with a $76,000 debit balance in its Accounts Receivable account. During the accounting period, River Co. earned revenue on account of $311,200. The ending...

Q:

1. Define the problem(s) in this case, using as many theories of motivation from this chapter as you think might apply.

Q:

1. Identify the barriers to motivation. Is the work challenging? Do you feel competent to perform the work? Are you getting needed feedback? Do you understand the expectations? Do you have the time...

Q:

5. What conclusions can you draw or what observations can you make about motivation theory and research?