# What is the law of noncontradiction

## What are examples of non contradictions?

The law of non-contradiction is a rule of logic. It states that if something is true, then the opposite of it is false. For example, if an animal is a cat, the same animal cannot be not a cat. Or, stated in logic, if +p, then not -p, +p cannot be -p at the same time and in the same sense.

## What are the 3 laws of logic?

Laws of thought, traditionally, the three fundamental laws of logic: (1) the law of contradiction, (2) the law of excluded middle (or third), and (3) the principle of identity.

## What is Aristotle’s law of non contradiction?

According to Aristotle, first philosophy, or metaphysics, deals with ontology and first principles, of which the principle (or law) of non-contradiction is the firmest. … According to Aristotle, the principle of non-contradiction is a principle of scientific inquiry, reasoning and communication that we cannot do without.

## What is law of contradiction in philosophy?

In logic, the law of non-contradiction (LNC) (also known as the law of contradiction, principle of non-contradiction (PNC), or the principle of contradiction) states that contradictory propositions cannot both be true in the same sense at the same time, e. g. the two propositions “A is B” and “A is not B” are mutually …

More precisely, it is the belief that there can be a true statement whose negation is also true. Such statements are called “true contradictions”, dialetheia, or nondualisms. … Graham Priest defines dialetheism as the view that there are true contradictions.

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## Can two completely opposite statements both be true?

According to fundamental mathematical theory, if a statement p is true, then its opposite is false. … Two statements with contradictory meanings cannot be both true. But the context of the two statements can be different so that the statements although contradictory in words are not contradictory in meaning.

## What is the law of logic?

There are three laws upon which all logic is based, and they’re attributed to Aristotle. These laws are the law of identity, law of non-contradiction, and law of the excluded middle. According to the law of identity, if a statement is true, then it must be true.

## Who invented logic?

philosopher Parmenides

## What is the difference between emotion and logic?

Emotion: Winning People’s Hearts. Whereas logic is the language of the conscious mind, emotion is the language of the unconscious mind. We know that emotions are reactions to perceived and imagined stimuli, not based on logic, but on one’s own personal experiences. Emotions often outweigh our logic.

## What is Aristotle’s law?

Aristotle’s laws of motion. In Physics he states that objects fall at a speed proportional to their weight and inversely proportional to the density of the fluid they are immersed in. This is a correct approximation for objects in Earth’s gravitational field moving in air or water.

## Why is the law of non contradiction important?

The law of non-contradiction teaches that two opposing statements cannot both be true in the same time and the same sense. Time is an essential context to a truth claim. … Any conception of truth outside of its being objective will ultimately lead to a logical contradiction, and is therefore impossible.

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## What are the four laws of logic?

The Fundamental Laws of Thought, or the conditions of the thinkable, as commonly received, are four: — 1. The Law of Identity; 2. The Law of Contradiction; 3. The Law of Exclusion or of Excluded Middle; and, 4.

## What is the law of contradiction in logic?

noun Logic.

the law that a proposition cannot be both true and false or that a thing cannot both have and not have a given property.

## What is the law of identity philosophy?

In logic, the law of identity states that each thing is identical with itself. It is the first of the three laws of thought, along with the law of noncontradiction, and the law of excluded middle. … It is that which is expressed by the equals sign “=”, the notion of identity or equality.