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## Main Question or Discussion Point

Hi all!

When we talk about the Einstein Field equations.

What do we mean with "extremal proper time" or "extremal path"?

Why "extremal" ?

and why "proper" ?

and why do we need to introduce the concept of "geodesic" ?

Cheers

When we talk about the Einstein Field equations.

What do we mean with "extremal proper time" or "extremal path"?

Why "extremal" ?

and why "proper" ?

and why do we need to introduce the concept of "geodesic" ?

Cheers

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