# What reasons do I have to believe that ~p->~q and pV~q are equivalent?

## Are the statements P Q and ~( Pvq equivalent?

It means that either p is false or q is false or they are both false–anyway, p and q can’t both be true at the same time. So ~(p · q) º ~p v ~q. On the other hand, ~(p v q) means it’s not the case that either p or q. In other words, they ate both not true.

## What is equivalent to Pvq?

PVQ is equivalent to QVP. Associative laws PA(QAR) is equivalent to (PAQAR.

## What is the difference between P Q and Pvq?

p v q stands for p or q That is: p v q iff at least one of p or q is true. Note that they may both be true. p ↔ q or p ≡ q stands for p iff q That is: p ↔ q iff either both p and q are true or both p and q are false, i.e. p has the same ‘truth value’ as q.

## Is the negation logically equivalent?

The negation of a conjunction (logical AND) of 2 statements is logically equivalent to the disjunction (logical OR) of each statement’s negation. That sounds like a mouthful, but what it means is that “not (A and B)” is logically equivalent to “not A or not B”.

## Is P q equivalent to P q justify?

A compound proposition that is always True is called a tautology. Two propositions p and q are logically equivalent if their truth tables are the same. Namely, p and q are logically equivalent if p ↔ q is a tautology. If p and q are logically equivalent, we write p ≡ q.

## What does Pvq mean in truth table?

p <-> q is another way of saying: “p is true if and only if q is true“. If both p and q are true, then the equivalency statement of p <-> q is true. If both p and q are false, then the equivalency statement of p <-> q is still true.

## What truth values do you get for Pvq?

Remember that now that we have two letters, p and q, instead of just one letter, we have four possible combinations of truth values for p and q: p could be true and q could be true. p could be true and q could be false. p could be false and q could be true.

## Are the statements P ∧ Q ∨ R and P ∧ Q ∨ R logically equivalent?

Since columns corresponding to p∨(q∧r) and (p∨q)∧(p∨r) match, the propositions are logically equivalent. This particular equivalence is known as the Distributive Law.

## Which of these is true about the disjunction of p and q Pvq?

Which word is used to form the disjunction of two statements?

Q. In Disjunction, if p is true and q is false, p v q is ——-
C. cannot be determined
D. none of these

## Under what circumstances is a disjunction false?

Summary: A disjunction is a compound statement formed by joining two statements with the connector OR. The disjunction “p or q” is symbolized by p q. A disjunction is false if and only if both statements are false; otherwise it is true.

## How do you prove logical equivalence?

Two logical statements are logically equivalent if they always produce the same truth value. Consequently, p≡q is same as saying p⇔q is a tautology.

## What is logically equivalent to P and q?

The propositions are equal or logically equivalent if they always have the same truth value. That is, p and q are logically equivalent if p is true whenever q is true, and vice versa, and if p is false whenever q is false, and vice versa. If p and q are logically equivalent, we write p = q.

## Which statements are logically equivalent to PQ?

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. A conditional statement is logically equivalent to its contrapositive.

## What are equivalent statements?

Equivalent Statements are statements that are written differently, but hold the same logical equivalence.

## How do you prove logical equivalence with truth tables?

Quote:
So the way we can use truth tables to decide whether. The left side is logically equivalent to the right it's just to make a truth table for each one and see if it works out the same.

## What makes two statements logically equivalent the two statements are logically equivalent when they?

Logical equivalence occurs when two statements have the same truth value. This means that one statement can be true in its own context, and the second statement can also be true in its own context, they just both have to have the same meaning.

## What does it mean for two statements to be logically equivalent?

Two expressions are logically equivalent provided that they have the same truth value for all possible combinations of truth values for all variables appearing in the two expressions. In this case, we write X≡Y and say that X and Y are logically equivalent.

## What is logical equivalence examples?

Now, consider the following statement: If Ryan gets a pay raise, then he will take Allison to dinner. This means we can also say that If Ryan does not take Allison to dinner, then he did not get a pay raise is logically equivalent.

## How do you prove two statements are equivalent?

You are supposed to formally prove that both statements imply each other. Let H(P) be “P0 H(P) implies ∃P H(P). The first one implies the second one because if you have H(P) then you can find P′ such that P′>0 and H(P′).

## What are equivalence rules?

Recall that two propositions are logically equivalent if and only if they entail each other. In other words, equivalent propositions have the same truth value in all possible circumstances: whenever one is true, so is the other; and whenever one is false, so is the other.

## What are equivalents in chemistry?

An equivalent (symbol: officially equiv; unofficially but often Eq) is the amount of a substance that reacts with (or is equivalent to) an arbitrary amount (typically one mole) of another substance in a given chemical reaction.

## Is there any practical significance to logical equivalence?

Logical equivalence is important in the design of digital circuits. Several circuits may be logically equivalent, in that they all have identical truth table s. The goal of the engineer is to find the circuit that performs the desired logical function using the least possible number of gates.

## What is equivalent formula?

Two formulas P and Q are said to be logically equivalent if P ↔ Q is a tautology, that is if P and Q always have the same truth value when the predicate variables they contain are replaced by actual predicates. The notation P ≡ Q asserts that P is logically equivalent to Q.

## Is an equivalence relation?

An equivalence relation is a relationship on a set, generally denoted by “∼”, that is reflexive, symmetric, and transitive for everything in the set.

## What is material equivalence?

Two propositions are materially equivalent if and only if they have the same truth value for every assignment of truth values to the atomic propositions. That is, they have the same truth values on every row of a truth table.

## What is the difference between logical equivalence and material equivalence why is the distinction so important in logic?

Logical equivalence is different from material equivalence. Formulas p and q are logically equivalent if and only if the statement of their material equivalence (P ⟺ Q) is a tautology. Material equivalence is associated with the biconditional.

## Which logic operation is known as equivalence operation?

In mathematics, the plus sign “+” almost invariably indicates an operation that satisfies the axioms assigned to addition in the type of algebraic structure that is known as a field.

Logical equality.

EQ, XNOR
Monotone no
Affine yes
v t e