What do PF signatures mean?

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In summary, Physics did not begin in London in 1686, but 2 centuries later in 1874 in Kristiania with the discovery of equations by Newton and the establishment of invariants by Lie.
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dextercioby

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Physics did not begin in London in 1686. It began 2 centuries later in 1874 in Kristiania.
@fresh_42 Sorry for the blatant off-topic, please explain this text in your signature. Thanks!

Physics did not begin in London in 1686. It began 2 centuries later in 1874 in Kristiania.
 
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  • #2
dextercioby said:
Physics did not begin in London in 1686. It began 2 centuries later in 1874 in Kristiania.
@fresh_42 Sorry for the blatant off-topic, please explain this text in your signature. Thanks!
1686 was Newton, but 1874 was Lie.
 
  • #3
Aaa, 1686 was what? Principia was published in 1687. And 1874 is the birth year of Sophus Lie, right?
 
  • #4
dextercioby said:
Aaa, 1686 was what? Principia was published in 1687.
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dextercioby said:
And 1874 is the birth year of Sophus Lie, right?
https://www.physicsforums.com/insights/when-lie-groups-became-physics/
 
  • #5
Oh, the irony/controversy.
Capture.JPG
 
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  • #6
It might be the final manuscript date vs. the publication year.

I had no idea Samuel Pepys was involved. Whaddaya know.
 
  • #7
dextercioby said:
Oh, the irony/controversy.
Maybe, it could be summarized as: Newton found the equations, and Lie established the invariants.
 

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