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In mathematics infinity is a defined numeric quantity greater in magnitude than any finite numeric quantity, whereas undefined refers simply to something lacking a definition (e.g. the result of division by zero is undefined, not infinity). If you study set theory, you will find there are many different infinities some greater in magnitude than others. Infinity though defined is not a simple concept.

Q: What is difference between 'infinity' and 'undefined'?

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both are equal... infinity is the representation of undefined.

Value of log 0 is negative infinity (undefined). Because no power can give an answer of zero. it is in fact undefined but written as negative infinity for symbolizing. Otherwise undefined and infinity are two different things.

zero is horizontal, undefined is vertical

Zero is nothing, infinity is everything.

Infinity is a concept, not an actual number. Someone may say the number of stars is infinite, or that the number of fractions between 0 and 1 is infinite, or that the number of even numbers is infinite. But these are not things that can be subtracted.

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both are equal... infinity is the representation of undefined.

The mathematical symbol for "undefined" is the infinity symbol.

Value of log 0 is negative infinity (undefined). Because no power can give an answer of zero. it is in fact undefined but written as negative infinity for symbolizing. Otherwise undefined and infinity are two different things.

It would be infinity. If you divide zero by 1, you'll get infinity (or undefined, depending on how specific you want to be.) If you divide zero by 2, you'll still get infinity. There is no difference, no matter what you divide it by as long as it is a positive number.

It IS undefined.

zero is horizontal, undefined is vertical

Zero is nothing, infinity is everything.

The difference is infinity. Infinity is the concept of the largest possible number. Even if you take 20 away the number will still be infinity.

undefined (infinity)

infinity? Infinity over zero is undefined, or complex infinity depending on numbers you are including in your number system.

By its very name .. it is UNDEFINED. Even in the Extended Real Number set containing +-infinity these elements are UNDEFINED.

Infinity is a concept, not an actual number. Someone may say the number of stars is infinite, or that the number of fractions between 0 and 1 is infinite, or that the number of even numbers is infinite. But these are not things that can be subtracted.