Finding the Middle: Calculating In-Between Numbers

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Discussion Overview

The discussion revolves around how to mathematically express the quantity of numbers that lie between two given numbers, specifically focusing on integers. Participants explore various interpretations and formulations related to this concept.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification
  • Debate/contested
  • Mathematical reasoning

Main Points Raised

  • One participant suggests that between the numbers six and three, there are two integers (4 and 5), but this is challenged by another who points out that there are infinitely many real numbers between them.
  • Another participant clarifies that when counting integers strictly between 3 and 6, the count is 2, and when including the endpoints, it is 4.
  • A formula is proposed by a participant for calculating the number of integers strictly between two integers n and m, given as n - m - 1.
  • There is a discussion about the notation 3 < a < 6, with some participants asserting that it represents the integers 4 and 5, while others emphasize the existence of infinitely many real numbers in that range.
  • A participant expresses a desire to find a common term for the "in between amount," distinguishing it from the difference between the two numbers.
  • Questions are raised about the commonality of asking for such values and their practical applications in everyday life.

Areas of Agreement / Disagreement

Participants generally agree on the existence of integers between the two numbers but disagree on the terminology and the broader implications of counting numbers versus real numbers. The discussion remains unresolved regarding a common term for the quantity of integers between two numbers.

Contextual Notes

There is a limitation in the discussion regarding the definitions of "in between" as it varies between integers and real numbers, leading to different interpretations and assumptions about the context of the question.

Square1
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OK so this is probably a very silly and easy question...

How do you say mathematically the amount that is in between to numbers?

For example, between six and three, there are two numbers (4 and 5). But you don't say that it is the difference of 6 and 3, because that is saying 6 - 3 right? ... = 3.
 
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Square1 said:
For example, between six and three, there are two numbers (4 and 5).
Sorry to nitpick, but this is not true. There are a heck of a lot of numbers between 3 and 6: 3.5, 16/3, π, 5.714285714... the list goes on.
 
Square1 said:
OK so this is probably a very silly and easy question...

How do you say mathematically the amount that is in between to numbers?

For example, between six and three, there are two numbers (4 and 5). But you don't say that it is the difference of 6 and 3, because that is saying 6 - 3 right? ... = 3.

You are counting integers - a very small subset of numbers.
The number of integers between 3 and 6 - exclusive of 3 and 6 - is 2.
The number of integers between 3 and 6 - inclusive of 3 and 6 - is 4.
 
Square1 said:
OK so this is probably a very silly and easy question...

How do you say mathematically the amount that is in between to numbers?

For example, between six and three, there are two numbers (4 and 5). But you don't say that it is the difference of 6 and 3, because that is saying 6 - 3 right? ... = 3.

Are you looking for a formula? If n and m are integers with n > m then the number of integers strictly between them is n - m - 1.
 
did u mean this... 3 < a < 6..? so that the number of a is 3 and 4..
 
all-black said:
did u mean this... 3 < a < 6..? so that the number of a is 3 and 4..
No. If a is an integer, then the two values that satisfy this inequality are 4 and 5. If a is a real number, then there are an uncountable infinity of numbers between 3 and 6.

Also, please refrain from using "textspeak" such as u for you.
 
Mark44 said:
No. If a is an integer, then the two values that satisfy this inequality are 4 and 5. If a is a real number, then there are an uncountable infinity of numbers between 3 and 6.

Also, please refrain from using "textspeak" such as u for you.

ohh.. i see that..

sorry for the inconvenience also..
just a new member here..
 
Hey sorry I guess I should have been more detailed. No, its not nitpicking. Yea I am talking about integers. Dave and Kurtz seem to be heading more in the direction that I wanted to.

Excluding the two outside numbers, one would say there are two integers (ie whole units) in between 3 and 6. So again, how else do you say this this mathematically that is as natural and common as asking to someone to subtract let's say a price from the amount paid. I've noticed that the result is as Kurtz says...((n-m) -1), but I am looking for a name for this value. The difference between n and m is , well, the difference, given by n-m. This "in between amount" thing is however n-m-1.

Is it common to ask of such values? Where in life do you often want to know that kind of value?

Thanks all.
 

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