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4-D Question

No,
real life humans is a perfect example; our universe is 4-D (3 spatial dimensions length width and depth, and 1 dimension of time) and even tho we exist in a 4-D construct we are not 4-D
i've heard that being born in a place that isn't a manifold can give a char 4-D dimensionality, due to humans only living in the 3-D space of the manifold. but that apparentaly being born from the 4-D part and not the 3-D part can give 4-D
 
No,
real life humans is a perfect example; our universe is 4-D (3 spatial dimensions length width and depth, and 1 dimension of time) and even tho we exist in a 4-D construct we are not 4-D
That's not 4D in that sense though, that's still 3D but with time, spacetime is indeed 4D but it contains a 3D world for us, so is not a good comparasion.

In this case i assume they are native of the actual 4D world so they should be just as big if they can manevour and affect it like we do with ours.
 
That's not 4D in that sense though, that's still 3D but with time, spacetime is indeed 4D but it contains a 3D world for us, so is not a good comparasion.

In this case i assume they are native of the actual 4D world so they should be just as big if they can manevour and affect it like we do with ours.
While true, you can technically argue it is possible for them to being 3 dimensional beings in a 4D space time environment.

Also blackholes are technically 4D in a more limited scale and not a pocket dimension IIRC.
 
While true, you can technically argue it is possible for them to being 3 dimensional beings in a 4D space time environment.
That would require more assumptions than otherwise, since we are talking about a 4-D space, not a 4-D space-time

If said 4-D space had a temporal dimension it'd be a 5-D spacetime manifold instead.
 
That would require more assumptions than otherwise, since we are talking about a 4-D space, not a 4-D space-time

If said 4-D space had a temporal dimension it'd be a 5-D spacetime manifold instead.
Basically, we are 3D represented by (length, width, space) +Temporal dimension, if space represents 3D and 4D then the world has 5D starting from (point, length, width, spatial¹, spatial²) +Temporal Dimension

Is this what you mean?
 
That would require more assumptions than otherwise, since we are talking about a 4-D space, not a 4-D space-time

If said 4-D space had a temporal dimension it'd be a 5-D spacetime manifold instead.
From my point of view, our universe is technically 3 dimensional with time being that additional dimension since our being is 3D physically speaking of course as this has the case in real life actually.

Now if the universe irl was actually 4D, then that is a different story as we don’t technically have proven the existence of 5D as it is all theoretical, not set in stone fact if I gonna been honest.
 
Anyway, back to the question the OP have.

Since @Thelastmlg make his answer and I will make my own.

Technically if they came from a 4D place, but they were born with a 3D body and perspective, I usually don’t consider them automatically 4D in the sense they could given only 3 dimensional shape rather than a 4 dimension shape.
 
From my point of view, our universe is technically 3 dimensional with time being that additional dimension since our being is 3D physically speaking of course as this has the case in real life actually.

Now if the universe irl was actually 4D, then that is a different story as we don’t technically have proven the existence of 5D as it is all theoretical, not set in stone fact if I gonna been honest.
How is that relevant to what I said? Again, we were talking about a 4-D space, not a 4-D space-time/universe. Humans are born in 3-D space, so 3-D beings. If they were born on 4-D space, then 4-D beings.
 
How is that relevant to what I said? Again, we were talking about a 4-D space, not a 4-D space-time/universe. Humans are born in 3-D space, so 3-D beings. If they were born on 4-D space, then 4-D beings.
Yeah, that is fair, but I was thinking if they were born in the 3 dimensional space of a 4 dimensional universe, then wouldn’t that result them being 3D rather than 4D in that case?

I don’t think it should been a automatically being 4D thing in my opinion though.
 
If you mean a normal universe, it does not have a 4-D space, only 3-D space + 1 temporal dimension, so they'd be 3-D. If you are talking about an abnormal universe that has 4 spatial dimensions + 1 temporal then they'd be pretty much 4-D, since a 3-D space wouldn't be a thing there to begin with. Its the same logic for the normal universe but now with an extra axis added.
 
If you mean a normal universe, it does not have a 4-D space, only 3-D space + 1 temporal dimension, so they'd be 3-D. If you are talking about an abnormal universe that has 4 spatial dimensions + 1 temporal then they'd be pretty much 4-D, since a 3-D space wouldn't be a thing to begin with. Its the same logic for the normal universe but now with an extra axis added.
Since this is fiction, I do think it is possible for a character to having a 3D existence in a 4 dimensional space since 3D space isn’t being removed though, but just have a additional spatial dimension being slapped on it.

I not sure if the logic is completely sound though as I honestly do think 3 dimensional space not being a thing in 4 dimensional isn’t necessarily true although that is probably something that never done before anyway.
 
Since this is fiction, I do think it is possible for a character to having a 3D existence in a 4 dimensional space since 3D space isn’t being removed though, but just have a additional spatial dimension being slapped on it.
I understand what you mean, for example we are one of the characters whose existence is only 3D and we live in a 5D world, which where we have an extra spatial Dimension above us, we will not be able to see it because this is impossible
I not sure if the logic is completely sound though as I honestly do think 3 dimensional space not being a thing in 4 dimensional isn’t necessarily true although that is probably something that never done before anyway.
This is not logic but mere theory
 
Also if I not mistaken, logic has always been used in theories, otherwise what is the point of theories without logic?
 
Also if I not mistaken, logic has always been used in theories, otherwise what is the point of theories without logic?
Theory is just an opinion that we can not explain firmly, it is still related to logic, we have two theories, 1 true theory and 2 false theories
 
Theory is just an opinion that we can not explain firmly, it is still related to logic, we have two theories, 1 true theory and 2 false theories
Tbf there is also theories that can not been confirmed nor disproven too since it is simply can not been tested as a good example(s) will been the multiverse theories.
 
Higher dimensions encompass lower dimensions by default, so someone coming from a 3D space is also coming from a 4D space by default.
 
Higher dimensions encompass lower dimensions by default, so someone coming from a 3D space is also coming from a 4D space by default.
Also, if they are in 4D space but they are only 3D, their body is still the same as ours, but not for the character who is in 4D space, maybe his body will be doubled so that we can't think of it
 
Also, if they are in 4D space but they are only 3D, their body is still the same as ours, but not for the character who is in 4D space, maybe his body will be doubled so that we can't think of it.
The guy in 4D space would be able to see his or your insides.
 
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