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The common idea is that, on one hand we have "I don't have X", on the other hand we have "I have X, but X has some its quality equal to zero, making it to behave the same way as if it didn't exist", where X can be some object or property of mine.

Other examples. "I don't have speed"(because I don't move) VS "I have speed, but it's equal to zero"

"a point doesn't have length, area or volume" VS "a point has length, area and volume, but all of them are equal to zero"

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  • The difference is not philosophical but linguistic, so English SE is a better place for this. Not every X is quantifiable for "zero X" to make sense, and flat horns will have zero volume. The use of "zero X" is typical in formalized situations where it allows to include degenerate cases, for example.
    – Conifold
    Oct 16 at 14:25
  • @Conifold How about "a point doesn't have length, area or volume" VS "a point has length, area and volume, but all of them are equal to zero"? Maybe philosophy of mathematics can say if there is difference between them?
    – user161005
    Oct 16 at 14:35
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"I don't have speed" does not mean the same thing as "I have speed, but it's equal to zero." The latter means that your position does not change in time (i.e. that you don't move), while the former means that your position is not given by a differentiable function of time. Speed is defined as the magnitude of the derivative of position with respect to time. There is a difference between saying this is equal to zero and saying it doesn't exist.

"a point doesn't have length, area or volume" VS "a point has length, area and volume, but all of them are equal to zero"

In general, "length," "area," and "volume" are defined as the 1-, 2-, and 3-dimensional Lebesgue measures, respectively. Since all of these are defined for a single point and equal to zero for that, it would be incorrect to say "a point doesn't have length, area or volume," unless you are in some context in which those terms are defined differently.

Getting back to your original question about horns, since we have not given a precise definition of "horns," the point about zero volume is irrelevant, since it may be the case that the significance of these horns does not depend on their volume. For instance, let's say you have horns that have a hole in them, and we are interested in whether the space around your horns (the complement of your horns) is simply connected. The answer to this question would be yes if you have no horns, while it would be no if you did, even if the horns had zero volume. Thus, we are comparing the statements "I have no horns" and "I have horns," which are clearly different.

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Is there any philosophical difference between "I have no horns" and "I have horns, but they have zero volume"?

There is an enormous philosophical difference between these two statements but it has zero volume!

One difference is that "I have no horns" has existential import whereas "I have horns, but they have zero volume" does not.

Further, the former is either true or false. The latter is neither: I have one billion dollars, but they have zero value. Nobody can tell you whether this is true or false.

Thus, the difference is logical, with implications for the philosophy of logic.

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  • "One difference is that "I have horns" has existential import" It seems like you missed word "no" in "I have no horns"
    – user161005
    Oct 16 at 16:50
  • @user161005 Thanks, corrected. Oct 16 at 16:58
  • " 'I have no horns' has existential import" Wait, how can it have existentional import? It states non-existence
    – user161005
    Oct 16 at 17:12
  • @user161005 "It states non-existence" Precisely. Oct 16 at 19:10
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One important distinction of this kind arises in statistics (and is closely related to measure theory, as mentioned in Sandejo's answer). Consider a random variable $X$ that's uniformly distributed over $[0, 1]$; i.e., $X$ is equally likely to take the value of any real number between $0$ and $1$. The probability of $X$ taking on any specific number in that range, such as $\tfrac{1}{2}$, is 0. We say that it's "almost sure" that $X ≠ \tfrac{1}{2}$. But $X$ still can, and must, take on one of these values. By contrast, it can't be 2, so $X ≠ 2$ with no qualifications.

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  • Note that MathJax is not enabled on this site, so your math formatting does not show up properly.
    – Sandejo
    Oct 17 at 20:56
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    @Sandejo The math and stats sites get it, but not the philosophy site? Lame. Oct 18 at 0:04
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    Oct 18 at 23:07
  • @Community If a human has any questions about this post, I would be happy to clarify. Seeing as you're a robot, however, and not capable of understanding this post in any case, kindly shut the hell up. Oct 19 at 11:34

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