en: Where is invariant mass and invariant energy equals . The squared mass is still positive and the particle can be stable . Where is invariant mass and invariant energy the same , the squared mass is still positive and the particle can be stable .
ms: Di mana jisim invarian dan tenaga invarian sama. Jisim kuasa dua masih positif dan zarah boleh stabil. Di mana jisim invarian dan tenaga invarian sama, jisim kuasa dua masih positif dan zarah boleh stabil.