E² = p²c² + (mc²)²

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  • #1
quasar987
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  • #3
quasar987
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As it often happens I found the answer to my question while typing it :tongue2:

[itex]\eta[/itex] was for the proper speed... i.e. [itex]\eta_{0,x,y,z}[/itex] are the components of the four-velocity. What symbol do you use?
 
  • #4
dextercioby
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Ita is for the metric...[itex] u_{\mu} [/itex] is the four-velocity...

Daniel.
 
  • #5
quasar987
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What's a 'metric' ?
 
  • #6
dextercioby
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A distance,in mathematics (a metric space is a topological space with a metric)...Here,in physics jargon,it stands for the metric tensor [itex] g_{\mu\nu} [/itex] for spacetime and for the flat Minkowski spactime [itex] \eta_{\mu\nu} [/itex]

Daniel.
 
  • #7
krab
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quasar: [itex]\eta[/itex] is pronounced like something between etta and ayta; not eeta.
 
  • #8
dextercioby
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In Neogreek it is pronounced ITA (eeta,if u want to).True,in Anciant Greek it's ETA...

Daniel.
 

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