# What rule of inference is used in this argument?

## What rule of inference is used in this argument?

What rules of inference are used in this argument? All students in this science class has taken a course in physics and Marry is a student in this class imply the conclusion Marry has taken a course in physics. Explanation: xP (x), P (c) Universal instantiation.

## What are the 9 rules of inference?

Terms in this set (9)Modus Ponens (M.P.) -If P then Q. -P. Modus Tollens (M.T.) -If P then Q. Hypothetical Syllogism (H.S.) -If P then Q. Disjunctive Syllogism (D.S.) -P or Q. Conjunction (Conj.) -P. Constructive Dilemma (C.D.) -(If P then Q) and (If R then S) Simplification (Simp.) -P and Q. Absorption (Abs.) -If P then Q.

**What is a valid inference in math?**

When a valid argument is used to derive a false conclusion from a false premise, the inference is valid because it follows the form of a correct inference. A valid argument can also be used to derive a true conclusion from a false premise: All tall people are musicians.

**Is disjunctive syllogism valid?**

In classical logic, disjunctive syllogism (historically known as modus tollendo ponens (MTP), Latin for “mode that affirms by denying”) is a valid argument form which is a syllogism having a disjunctive statement for one of its premises.

### What is an example of disjunctive syllogism?

For example, if someone is going to study law or medicine, and does not study law, they will therefore study medicine.

### What is if A then B?

A statement of the form “If A, then B” asserts that if A is true, then B must be true also. If the statement “If A, then B” is true, you can regard it as a promise that whenever the A is true, then B is true also. Most theorems can be stated in the form “If A, then B.”

**What is an example of an IF THEN statement?**

Here are some examples of conditional statements: Statement 1: If you work overtime, then you’ll be paid time-and-a-half. Statement 2: I’ll wash the car if the weather is nice. Statement 3: If 2 divides evenly into \begin{align*}x\end{align*}, then \begin{align*}x\end{align*} is an even number.

**What is if/then form?**

Hypotheses followed by a conclusion is called an If-then statement or a conditional statement. This is noted as. p→q. This is read – if p then q. A conditional statement is false if hypothesis is true and the conclusion is false.

## Which term best describes if A then B?

A shape can have more than one line of symmetry. A statement that has the form “If A, then B,” where A is what you assume is true and B is the conclusion.

## Which type of statement has the form A then B?

A conditional statement is one that can be put in the form if A, then B where A is called the premise (or antecedent) and B is called the conclusion (or consequent).

**What is a condition computer science?**

In computer science, conditional statements, conditional expressions and conditional constructs are features of a programming language, which perform different computations or actions depending on whether a programmer-specified boolean condition evaluates to true or false.

**What is the Contrapositive of a statement?**

To form the contrapositive of the conditional statement, interchange the hypothesis and the conclusion of the inverse statement. The contrapositive of “If it rains, then they cancel school” is “If they do not cancel school, then it does not rain.” If the converse is true, then the inverse is also logically true.

### How do you prove Contrapositive?

More specifically, the contrapositive of the statement “if A, then B” is “if not B, then not A.” A statement and its contrapositive are logically equivalent, in the sense that if the statement is true, then its contrapositive is true and vice versa.

### What is the Contrapositive of a statement example?

Mathwords: Contrapositive. Switching the hypothesis and conclusion of a conditional statement and negating both. For example, the contrapositive of “If it is raining then the grass is wet” is “If the grass is not wet then it is not raining.”

**What does Contrapositive mean in logic?**

In logic and mathematics, contraposition refers to the inference of going from a conditional statement into its logically equivalent contrapositive, and an associated proof method known as proof by contraposition. The contrapositive of a statement has its antecedent and consequent inverted and flipped.

**Is Contrapositive the same as Contraposition?**

As nouns the difference between contrapositive and contraposition. is that contrapositive is (logic) the inverse of the converse of a given proposition while contraposition is (logic) the statement of the form “if not q then not p”, given the statement “if p then q”.

## What is the Contrapositive of P → Q?

Contrapositive: The contrapositive of a conditional statement of the form “If p then q” is “If ~q then ~p”. Symbolically, the contrapositive of p q is ~q ~p.

## Is Converse always true?

The truth value of the converse of a statement is not always the same as the original statement. For example, the converse of “All tigers are mammals” is “All mammals are tigers.” This is certainly not true. The converse of a definition, however, must always be true.

**What is converse and Contrapositive?**

The converse of the conditional statement is “If Q then P.” The contrapositive of the conditional statement is “If not Q then not P.” The inverse of the conditional statement is “If not P then not Q.”

**What is a false converse?**

Switching the hypothesis and conclusion of a conditional statement. For example, the converse of “If it is raining then the grass is wet” is “If the grass is wet then it is raining.” Note: As in the example, a proposition may be true but have a false converse. See also.