# Logic question: Is ~(P&Q) equivalent to (~P&~Q)?

## Is ~( p q the same as P q?

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 does q → P mean?

The converse of a conditional proposition p → q is the proposition q → p. As we have seen, the bi- conditional proposition is equivalent to the conjunction of a conditional proposition an its converse. p ↔ q ≡ (p → q) ∧ (q → p)

## Is ~( P → q equivalent to P → q )?

Instead we will look at the logical form of the statement. We need to decide when the statement (P→Q)∨(Q→R) ( P → Q ) ∨ ( Q → R ) is true.

Truth Tables.

P Q P→Q
F F T

## Is P ∧ q → P is a tautology?

Since each proposition is logically equivalent to the next, we must have that (p∧q)→(p∨q) and T are logically equivalent. Therefore, regardless of the truth values of p and q, the truth value of (p∧q)→(p∨q) is T. Thus, (p∧q)→(p∨q) is a tautology.

## What does ∼ P ∧ q mean?

P ∧ Q means P and Q. P ∨ Q means P or Q. An argument is valid if the following conditional holds: If all the premises are true, the conclusion must be true. Some valid argument forms: (1) 1.

## Is Pvq the same as Qvp?

PVQ is equivalent to QVP. Associative laws PA(QAR) is equivalent to (PAQAR. PV(QVR) is equivalent to (PVO) VR. Idempotent laws PAP is equivalent to P.

## What are the truth values for ~( p ∨ Q?

So because we don’t have statements on either side of the “and” symbol that are both true, the statment ~p∧q is false. So ~p∧q=F. Now that we know the truth value of everything in the parintheses (~p∧q), we can join this statement with ∨p to give us the final statement (~p∧q)∨p.

Truth Tables.

p q p∨q
T F T
F T T
F F F

## Is P → Q ∨ q → p a tautology?

(p → q) ∧ (q → p). (This is often written as p ↔ q). Definitions: A compound proposition that is always True is called a tautology.

## Which of the following propositions is tautology Pvq → Qpv Q → P PV P → Q Both B & C?

The correct answer is option (d.) Both (b) & (c). Explanation: (p v q)→q and p v (p→q) propositions is tautology.

## When P is true and Q is false?

The conditional of q by p is “If p then q” or “p implies q” and is denoted by p q. It is false when p is true and q is false; otherwise it is true. Contrapositive: The contrapositive of a conditional statement of the form “If p then q” is “If ~q then ~p”.

## How do you find the truth value in logic?

Quote:
So 2 to the power of 2 is equal to 4 we should have 4 combinations. Where this is true true true false false true. And false false the next column in your truth table should be if P then Q.

## What is the truth value of the compound proposition P → Q ↔ P if P is false and Q is true?

Summary:

Operation Notation Summary of truth values
Negation ¬p The opposite truth value of p
Conjunction p∧q True only when both p and q are true
Disjunction p∨q False only when both p and q are false
Conditional p→q False only when p is true and q is false

## For which conditions is P ∨ q false?

Let p and q be propositions. The disjunction of p and q, denoted by p∨q, is the proposition “p or q.” The disjunction p∨q is false when both p and q are false and is true otherwise. when both parts of the statement need to be true. when one part of the statement is true and the other is false.

## Is P → q ↔ P a tautology a contingency or a contradiction *?

The proposition p ∨ ¬(p ∧ q) is also a tautology as the following the truth table illustrates.

## Is the conditional statement P → q → Pa tautology?

So … we conclude that it is impossible for (p∧q)→p to be False … meaning it is a tautology.

## What is an example of a tautology logic?

In mathematical logic, a tautology (from Greek: ταυτολογία) is a formula or assertion that is true in every possible interpretation. An example is “x=y or x≠y“. Similarly, “either the ball is green, or the ball is not green” is always true, regardless of the colour of the ball.

## What is an example of tautology?

Tautology is the use of different words to say the same thing twice in the same statement. ‘The money should be adequate enough‘ is an example of tautology. Synonyms: repetition, redundancy, verbiage, iteration More Synonyms of tautology.