XPost: sci.physics.relativity   
   From: PointedEars@web.de   
      
   Paul.B.Andersen wrote:   
   > Den 06.01.2026 09:15, skrev Thomas Heger:   
   >> Am Sonntag000004, 04.01.2026 um 20:51 schrieb Paul.B.Andersen:   
   >>> E = mc² is the energy content, or the energy equivalent of   
   >>> the mass m. Mass is invariant, so this equation is valid for   
   >>> all speeds of the mass.   
   >>   
   >> You contradicted yourself!!   
   >>   
   >> Here your claim is, that mass is invariant, while a little below you   
   >> claim, that energy is conserved, while mass has vanished from a   
   >> radioactive sample.   
   >>   
   >> But you can't keep both claims, because they contradict each other.   
   >   
   > Invariant means "the same in all frames of reference"   
   > or "independent of speed".   
      
   That is what *you* mean by it *here*, NOT what it *generally* means.   
      
   What *you* mean *here* is more precisely called "_Lorentz_-invariant".   
      
      
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