# Movie: What is a dimension? In 3D...and 2D... and 1D

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## Comments

Jake Hayward

If we lived in a 1-dimensional universe that looked 3d, how could we travel

from one point to another in so many different ways? Wouldn't we be forced

to take one route because it's only a 1-dimensional line? Could someone

explain?

The only explanation I can currently think of, is that there are an

infinite amount of 1-dimensional dimensions to connect each point together

to give the illusion of a 3-dimensional universe. I'm going to spend

several weeks looking into this.

from one point to another in so many different ways? Wouldn't we be forced

to take one route because it's only a 1-dimensional line? Could someone

explain?

The only explanation I can currently think of, is that there are an

infinite amount of 1-dimensional dimensions to connect each point together

to give the illusion of a 3-dimensional universe. I'm going to spend

several weeks looking into this.

RepriseOfxq010

The thing about 3D is that there are 3 continuous independent directions to

move, keywords being 'continuous' and 'independent'.

move, keywords being 'continuous' and 'independent'.

Dave Sheik

Qui a fait les sous titres français ? C'est dégueu sérieux !

Kyle Kinkade

What is a 1 dimensional curve? I mean, there is an x and y in a curve. Does

that mean that it's 2 dimensional? +MinutePhysics

that mean that it's 2 dimensional? +MinutePhysics

Sean Cossins

The notion of manipulating a "line" so that you need only use one

coordinate to represent R3 does not contradict the definition of dimension

from linear algebra. That is, the dimension of a finite vector space is the

cardinality of a linearly independent spanning set for that space.

Furthermore, to define such a "manipulated line" parametrically, you would

require a minimum of 3 vectors in order for it to occupy R3.

coordinate to represent R3 does not contradict the definition of dimension

from linear algebra. That is, the dimension of a finite vector space is the

cardinality of a linearly independent spanning set for that space.

Furthermore, to define such a "manipulated line" parametrically, you would

require a minimum of 3 vectors in order for it to occupy R3.

Arathi Suraj

How does a square and its side have the same number of points? Please

explain!

explain!

Ryan Banh

The description clearly states that One Direction is the new 3D

Bruce Key

At some point in the future, all human life will cease to exist, and the

earth will be completely gone, and all the science ever discovered from the

beginning of human existence... will be utterly and completely meaningless.

earth will be completely gone, and all the science ever discovered from the

beginning of human existence... will be utterly and completely meaningless.

Unknown

Gilberto Altamirano

0:10 +MinutePhysics Could you tell me When,where, who, and how did they

discover that?

discover that?

Albino173

To all the people in the comments that are confused about how we can only

be in a 1D world curled up to look 3D but it may as well be curled up into

2D, or how we can traverse this 3D world so many different ways instead of

being constrained to a 1D path. This video explains dimensions WRONG. A 1D

world cannot curl up on itself in if there is only 1 direction to move

along. A string would not bend if it was constrained to one direction of

motion. Multiple dimensions are constituted of multiple orthogonal

direction vectors. This means that each measurement of spacial direction

must be 90 degrees from each other so that neither one involves another. If

we are all living on a 1D line of space that is curled up then, A) There

must be 3 dimensional directions available in space for the line to curl up

though. or B) There must be multiple 1D lines connected all points along

our 1D line so that we can take free form paths to get from one point to

another instead of being constrained in every potential motion.

be in a 1D world curled up to look 3D but it may as well be curled up into

2D, or how we can traverse this 3D world so many different ways instead of

being constrained to a 1D path. This video explains dimensions WRONG. A 1D

world cannot curl up on itself in if there is only 1 direction to move

along. A string would not bend if it was constrained to one direction of

motion. Multiple dimensions are constituted of multiple orthogonal

direction vectors. This means that each measurement of spacial direction

must be 90 degrees from each other so that neither one involves another. If

we are all living on a 1D line of space that is curled up then, A) There

must be 3 dimensional directions available in space for the line to curl up

though. or B) There must be multiple 1D lines connected all points along

our 1D line so that we can take free form paths to get from one point to

another instead of being constrained in every potential motion.

B Sto

Does anybody know the dimensions of taste or smell?

Anna Kristín Halldórsdóttir

You know what. I would love it if you made extra videos with the math and

more in depth explanations. I wouldn't watch all of them, but a lot.

Because I feel like your videos are almost just like trailers that make me

want to know more! I for example understand what you said about the gas but

I don't understand how that proofs that we live in 3D... wouldn't it look

like that aswell if we were in a curled up 2D world?

That being said. I absolutely love your videos. Keep up the good work! :D

more in depth explanations. I wouldn't watch all of them, but a lot.

Because I feel like your videos are almost just like trailers that make me

want to know more! I for example understand what you said about the gas but

I don't understand how that proofs that we live in 3D... wouldn't it look

like that aswell if we were in a curled up 2D world?

That being said. I absolutely love your videos. Keep up the good work! :D

Maro rose

how can a 1D thing curl? It only has on dimension?

WELL MINUTE PHYSICS MAKE A VIDEO ABOUT THAT!

WELL MINUTE PHYSICS MAKE A VIDEO ABOUT THAT!

Thomas Pavlick

WHAT IS 1D?

Stefano Cipollone

You sound a bit unenthusiastic, hope everything is well.

SparkySywer

If we lived in a 1d universe, the 1d universe couldn't curl up on itself.

kenny levin

Albino talks too nuch

Archit Bajaj

.

Den mark

I don't understand everything he said

but I know 1D sucks

but I know 1D sucks

le Coops

I hope we don't live in 1D, their music sucks :P

Vinayak ns

If you lived in a 2d world how would you know 3 dimensions existed? Is it

possible that there are more than 3 but we cannot see/know/figure more than

3?

possible that there are more than 3 but we cannot see/know/figure more than

3?

Andrew Luo

Make a video about the 4th dimension :)

Maro rose

time is a dimension.

TheMrFloorball

if we could define our world a 1D line, we have to pass the following point

on the line before reaching another point, we couldn't go directly there

on the line before reaching another point, we couldn't go directly there

The UnReaL Graffiti

may sound dumb...but how did the square contain the same number of points

as its side???

as its side???

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