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What if 0 is special?

Дата публикации: 16-09-2026 11:00:24



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  • Level: High School 
  • Thread starter Thread starter Azhar
  • Start date Start date Sep 15, 2026
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TL;DR
Special 0 rule
[Mentor Note: Cross-posted threads merged]

Rule:
0×0=0
Think like this,×n is time to type a number
example:
1×2=2 is "type number 1 2 times then sum"
So 0×0=0 is "type number 0 0 time then sum" the result is 0 because it's 0 time so you're not type to the input bar

0÷0=1:
Its like "how much time to type 0 so the result is 0" the result is 1 because 0 is already 0,if it's 0 then you're not type the number to input bar

0²÷0:
x²÷x,the ÷x neutrilize the ² so the result is x

Example:
x=0
Standard:
lim r->0,μ->0 μ²÷r,result is 0÷0=indeterminate->Hôpital thing->0
F(x)=2x÷x=(2×0)÷0=0÷0=indeterminate
G(x)=x²÷x:
0²÷0=indeterminate
Non standard(zero exclusion):
0²÷0,÷0 neutrilize the ²(x²÷x=x) so the result is 0
F(x)=2x÷x=2×0=0÷0=1
G(x)=x²÷x:
÷x neutrilize the ² like in 2²÷2=2,so 0²÷0=0

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0 is already special. It is the additive identity in the Complex, Real, Integer, Natural, etc. number systems.

We use it a lot! So trying to redefine what it is is a very hard uphill struggle.

So I will just answer using the standard definition of numbers (and 0).

This is correct.
This is incorrect. Division by 0 is undefined.
Again, division by 0 is undefined.
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0 is already special. It is the additive identity in the Complex, Real, Integer, Natural, etc. number systems.

We use it a lot! So trying to redefine what it is is a very hard uphill struggle.

So I will just answer using the standard definition of numbers (and 0).

This is correct.

This is incorrect. Division by 0 is undefined.

Again, division by 0 is undefined.

But what if there's exception so the result is not indeterminate nor undefined
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You can make such an exception, but not with the real numbers.

The real numbers are a field and fields have an additive identity ##0## such that ##a+0=a## for all ##a## as well as a multiplicative identity ##1\ne 0## such that ##a \cdot 1 = a## for all ##a##. These lead to an additive inverse ##-a## such that ##a+(-a)=0## for all ##a## and a multiplicative inverse ##a^{-1}## such that ##a \cdot a^{-1}=1## for all ##a\ne 0##. Division is just shorthand for multiplication by the inverse ##a/b=a \cdot b^{-1}##.

From these you can prove that ##0 \cdot a = 0## for all ##a##:
$$0 \cdot a = (0+0) \cdot a$$$$0 \cdot a = 0 \cdot a + 0 \cdot a$$$$0 \cdot a + (- 0 \cdot a) = 0 \cdot a + 0 \cdot a + (- 0 \cdot a)$$$$ 0 = 0 \cdot a$$

Then the issue with assuming that ##0## has a multiplicative inverse is immediately apparent. Assume for proof by contradiction that ##0^{-1}## exists. By the multiplicative inverse definition ##0 \cdot 0^{-1}=1## but by the previous proof ##0 \cdot 0^{-1} = 0##. So ##0=1## which is a contradiction. Therefore ##0^{-1}## does not exist for the real numbers (or any field), so no expression of the form ##a\cdot 0^{-1}=b## is valid.

There are other number systems (not real numbers) where ##0^{-1}## does exist, but those numbers are not fields. So they lose a lot of the desirable proofs and properties that rely on being a field.

More briefly in your notation, if ##0/0=1## then $$1=0/0=(0\cdot 0)/0=0\cdot (0/0)=0\cdot 1=0$$ which is a contradiction.

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You can make such an exception, but not with the real numbers.

The real numbers are a field and fields have an additive identity ##0## such that ##a+0=a## for all ##a## as well as a multiplicative identity ##1\ne 0## such that ##a \cdot 1 = a## for all ##a##. These lead to an additive inverse ##-a## such that ##a+(-a)=0## for all ##a## and a multiplicative inverse ##a^{-1}## such that ##a \cdot a^{-1}=1## for all ##a\ne 0##. Division is just shorthand for multiplication by the inverse ##a/b=a \cdot b^{-1}##.

From these you can prove that ##0 \cdot a = 0## for all ##a##:
$$0 \cdot a = (0+0) \cdot a$$$$0 \cdot a = 0 \cdot a + 0 \cdot a$$$$0 \cdot a + (- 0 \cdot a) = 0 \cdot a + 0 \cdot a + (- 0 \cdot a)$$$$ 0 = 0 \cdot a$$

Then the issue with assuming that ##0## has a multiplicative inverse is immediately apparent. Assume for proof by contradiction that ##0^{-1}## exists. By the multiplicative inverse definition ##0 \cdot 0^{-1}=1## but by the previous proof ##0 \cdot 0^{-1} = 0##. So ##0=1## which is a contradiction. Therefore ##0^{-1}## does not exist for the real numbers (or any field).

There are other number systems (not real numbers) where ##0^{-1}## does exist, but those numbers are not fields. So they lose a lot of the desirable proofs and properties that rely on being a field.

but the text is about custom rule not about standard math 0^-1
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I understand that.

I showed why the custom rule you consider does not work for a field. So you can have either your custom rule or a field, not both.

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What if I combine both,what if the field axiom include exception for 0 but the exception is incomplete in field axiom so the custom rule complete it
I understand that.

I showed why the custom rule you consider does not work for a field. So you can have either your custom rule or a field, not both.

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Wait yeah you're correct,0²÷0≠0÷0 0²÷0=0×0÷0,PEMDAS so multiplication first before division,0×0=0 then 0÷0=1 but 0≠1

But what if it's PNEMDAS so "neutralize" before ()

Neutralize definition:
Divide number with exponent so

(x³)÷(x²):
÷x neutralize the ² so the result is x,if it's (x³) then ÷(x²)

example:
(x³)÷(x²)
÷(x²) neutralize the ³ so the result is x

(2³)÷(2²)
8÷4=2

So 0²÷0:
÷0 neutralize the ² so the result is 0,0×0÷0 then ÷0 neutralize the ×0 so the result is 0

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Well, I don't know what you are trying to get at. There are an infinite variety of rules that can be thought up. The ones we use have many applications, are consistent, lead to a lot of theorems that are useful, etc.

There is nothing wrong with investigating your own ideas as long as you don't go too far down a "rabbit hole" for no reason. But this forum is not a good place for that because we have rules which forbid indulging in unpublished personal theories.
I will leave further discussion to others.

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More than 1 x×more than 1 x≠x

1×1=1,there's exception in standard math so there's exception for 0 too, same as custom rule,the exception is for certain number not for every number,if u force 2×2=2 then it's incorrect

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You cannot combine both. I already showed that.
That would not work. Your new custom exception is (as I showed) logically incompatible with the other field axioms. You would have to remove some of the existing axioms to make your exception fit.

Then all of the previous books and papers based on the standard axioms of fields would have to be discarded. And since that includes the real numbers that would be a lot. It would require the biggest book burning in history by far.

No. The field axioms are well established. Trashing them is a non-starter. You simply need to accept that your concept is incompatible with the real numbers. If you wish to use your custom exception then you cannot use the real numbers.

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