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Old Jul 5th 2018, 12:45 PM   #1
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"What IS and What IS Not"

As you observe your monitor, try to forgrt this ...

If you see it and its there; Its Real.
If you don't see it but its there; Its Transparent.
If you see it and its not there; Its Virtual. and
If you don't see it and its not there; its Gone!

La Ti Da,

jp
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Old Jul 6th 2018, 02:32 AM   #2
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That reminds me of this:

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Old Jul 6th 2018, 09:13 AM   #3
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If so then define what Up and Down is?
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Old Jul 6th 2018, 09:48 AM   #4
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I would suggest that Up and Down are defined by the direction of acceleration of the frame of reference (aka "g" force or gravity).
This would imply that Up and Down are undefined for an inertial reference frame.
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Old Jul 6th 2018, 09:49 AM   #5
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Originally Posted by lancew561 View Post
If so then define what Up and Down is?
Who cares... there's no earthquakes where I am anyway!
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Old Jul 6th 2018, 11:06 AM   #6
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Reference?

You believe it really begins (down) with the source of the acceleration in comparison to the local forces like gravity. If multiple gravity or other fields interact it would also become undefinable lacking true reference frame and again remain undefinable also?

This means the definition is undefined as the definition?

And yes I do believe definition is most important frankly seeing science for years using many terms which are really not well defined to old or modern physics.

Hard to truly solve any equation without knowing exactly what the variables truly are is it not?
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Old Jul 7th 2018, 04:13 AM   #7
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Originally Posted by lancew561 View Post
You believe it really begins (down) with the source of the acceleration in comparison to the local forces like gravity. If multiple gravity or other fields interact it would also become undefinable lacking true reference frame and again remain undefinable also?

This means the definition is undefined as the definition?
Definitively!

And yes I do believe definition is most important frankly seeing science for years using many terms which are really not well defined to old or modern physics.

Hard to truly solve any equation without knowing exactly what the variables truly are is it not?
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Old Jul 7th 2018, 04:21 AM   #8
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Gosh and there was me thinking up and down were properties of quarks.

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Old Jul 7th 2018, 06:49 AM   #9
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Originally Posted by studiot View Post
Gosh and there was me thinking up and down were properties of quarks.

I like to think that I have a certain amount of charm and beauty, myself.

-Dan
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Old Jul 7th 2018, 06:53 AM   #10
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Originally Posted by lancew561 View Post
You believe it really begins (down) with the source of the acceleration in comparison to the local forces like gravity. If multiple gravity or other fields interact it would also become undefinable lacking true reference frame and again remain undefinable also?

This means the definition is undefined as the definition?

And yes I do believe definition is most important frankly seeing science for years using many terms which are really not well defined to old or modern physics.

Hard to truly solve any equation without knowing exactly what the variables truly are is it not?
As it happens there are two (at least) views about this. The first is that defining a coordinate system for a process is good because it gives a way to analytically break down the Mathematics of the process. The second is that many Mathematical developments in Physics come from almost entirely throwing away the concept of a coordinate system which allows us to proceed in a more theoretical way.

Putting the two together gives the concept that it does not matter which coordinate system we pick... we just have to stick to one once we've defined it.

-Dan
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