# How can one determine, and justify, that something is infinite?

That is, you must reach the end of the object. However, if you have an infinite amount of time to measure an infinite object, you will still never reach the end of it; you simply will always be in the act of measuring. That’s the thing with infinity; it’s never-ending.

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## How can you prove something is infinite?

Let B be a set. If for each finite subset S of B there is an element x∈B x ∈ B with x∉S, x ∉ S , then B is infinite. We apply this criterion for infinitude to proof that the set of natural numbers N is infinite.

## How do you explain infinity?

infinity, the concept of something that is unlimited, endless, without bound. The common symbol for infinity, ∞, was invented by the English mathematician John Wallis in 1655. Three main types of infinity may be distinguished: the mathematical, the physical, and the metaphysical.

## What is an example of something that is infinite?

Another good example of infinity is the number π or pi. Mathematicians use a symbol for pi because it’s impossible to write the number down. Pi consists of an infinite number of digits. It’s often rounded to 3.14 or even 3.14159, yet no matter how many digits you write, it’s impossible to get to the end.

## What makes a set finite or infinite?

If a set has the unlimited number of elements, then it is infinite and if the elements are countable then it is finite.

## How do you prove an infinite set is countable?

We say a set A is countably infinite if N≈A, that is, A has the same cardinality as the natural numbers. We say A is countable if it is finite or countably infinite. In the last two examples, E and S are proper subsets of N, but they have the same cardinality.

## How can infinity exist?

Although the concept of infinity has a mathematical basis, we have yet to perform an experiment that yields an infinite result. Even in maths, the idea that something could have no limit is paradoxical. For example, there is no largest counting number nor is there a biggest odd or even number.

## How do you explain infinity to a child?

. Infinity means many different things, depending on when it is used. The word is from a Latin word, which means “without end”. Infinity goes on forever, so sometimes space, numbers, and other things are said to be ‘infinite’, because they never come to a stop.

## What is truly infinite?

“For generally the infinite has this mode of existence: one thing is always being taken after another, and each thing that is taken is always finite, but always different.”

## What is an infinite set in math?

Definition of an Infinite Set. An infinite set is a set whose elements can not be counted. An infinite set is one that has no last element. An infinite set is a set that can be placed into a one-to-one correspondence with a proper subset of itself. No in-class assignment problem.

## Do all infinite sets have the same cardinality?

No. There are cardinalities strictly greater than |N|.

## How do you prove something is countable?

In mathematics, a set is countable if it has the same cardinality (the number of elements of the set) as some subset of the set of natural numbers N = {0, 1, 2, 3, …}.

## What is example of finite and infinite?

A set that has a finite number of elements is said to be a finite set, for example, set D = {1, 2, 3, 4, 5, 6} is a finite set with 6 elements. If a set is not finite, then it is an infinite set, for example, a set of all points in a plane is an infinite set as there is no limit in the set.

## What is an example of infinite loop?

An infinite loop occurs when a condition always evaluates to true. Usually, this is an error. For example, you might have a loop that decrements until it reaches 0.

## What is infinite in the universe?

It means space never ends. It’s a matrix of limitless galaxies, stars, planets, and energy. California Institute of Technology theoretical physicist Sean Carroll cautiously noted last spring that while a finite universe would be provable, scientists can never prove infinity.

## Is time finite or infinite?

As a universe, a vast collection of animate and inanimate objects, time is infinite. Even if there was a beginning, and there might be a big bang end, it won’t really be an end. The energy left behind will become something else; the end will be a beginning.

## Is infinite real?

In the context of a number system, in which “infinity” would mean something one can treat like a number. In this context, infinity does not exist.

## Who said the universe is infinite?

astronomer Thomas Digges

Such a universe does not have so-called spatial curvature; that is to say that it is ‘flat’ or Euclidean. A static infinite universe was first proposed by English astronomer Thomas Digges (1546–1595).

## Can there be an infinite past?

Each year is separated from any other by a finite number of years (remember that there’s no first year). There never was a time when the past became infinite because no set can become infinite by adding any finite number of members. So, if the past is infinite, then it has always been infinite.

## What does infinite time mean?

adj. a having no limits or boundaries in time, space, extent, or magnitude.

## Is it possible for time to end?

“I heard that Einstein’s Relativity said it is possible to stop time. Is that true and, if it is, how do you do it and what do you experience when time stops?” The simple answer is, “Yes, it is possible to stop time. All you need to do is travel at light speed.”