Thanks Lightarrow.

I will ask you more things, I'm sure.

But first I will need to assimilate what you already shown me.

Considering the average density of my head.

Quite thick I'm afraid.

It will take me some time:)

But, as they say in sunny California...

"I'll be back"

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They are different concepts, even because they have different units and one is a scalar while the other is a (pseudo) vector.

Given a system of N particles, you have:

Angular momentum (pseudo vector) = K = ∑i ri Λ mivi units: Joule*second

ri = position vector of the i-esim particle

mi = mass of the i-esim particle

vi = velocity of the i-esim particle

Λ = vectorial product

Rotational kinetic energy (scalar) = Er = ∑i (1/2)mi(viG)2 units: Joule

where viG is the velocity of the i-esim particle with respect to the centre of mass G. For a rigid body such velocities viG are all perpendicular to the vector radius from the axis of rotation; for this reason it could be demonstrated that

Er = (1/2)Iω2

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Yes, I can see that one is scalar and that the other describing the whole 'system / coin' of scalar 'bonds' will be seen as a vector (magnitude and direction)

Is there anywhere one can download the most common expressions of 'symbolic' expressions and their definitions?

Or do they change depending on what you use them for?

Often when I see those mathematical symbolic formulas they don't get explained.

And sometimes they don't seem to be bound to any 'definite description'

So doing like you do makes me want to put numbers into your formulas to see if I really understands them.

And that's why I will need to go slow.

This is a new language for me.

I've done some boolean logic, Computers and Philosophy, but that is the nearest I've ever cometh :)

So I do enjoy the care you take in explaining your concepts and math here.

Cheers.

yoron.