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61 views

Curvilinear abscissa confusion

How's exactly defined the curvilinear abscissa in kinematics? Surfing on the net I found different definitions: a) Fixed a point $O$ and a direction, the curvilinear abscissa $s$ at a point $P$ is ...
15
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1answer
1k views

Differentiating Propagator, Greens function, Correlation function, etc

For the following quantities respectively, could someone write down the common definitions, their meaning, the field of study in which one would typically find these under their actual name, and most ...