Siyini isici esikhethekile somqondo ka-Einstein wokulinganisela okukhethekile?
Context:Kwaze kwaba yiminyaka eminingana kamuva lapho u-Einstein esungula inkolelo-mbono evamile yokuthi izinto zihlobene, eyethula indawo nesikhathi egobekile ukuze ifake amandla adonsela phansi, igama elithi "inkolelo-mbono ekhethekile yokuthi izinto zihlobene" alizange lisetshenziswe. Ukuhumusha kwesinye isikhathi okusetshenzisiwe "ukuzibandakanya okulinganiselwe"; "okukhethekile" empeleni kusho "icala elikhethekile".[p 2][p 3][p 4][note 1] Eminye yemisebenzi ka-Albert Einstein ekuzibandakanyeni okukhethekile yakhelwe emsebenzini wangaphambilini kaHendrik Lorentz noHenri Poincaré. Lo mbono wagcwaliseka ngokuphelele ngo - 1907.  Le mfundiso "ikhethekile" ngoba isebenza kuphela esimweni esikhethekile lapho isikhala-isikhathi "sisicaba", okungukuthi, lapho ukugoba kwesikhala-isikhathi (umphumela we-energy<unk>momentum tensor futhi omele amandla adonsela phansi) kunganakwa. [note 2] Ukuze kulungiswe kahle amandla adonsela phansi, u-Einstein wasungula inkolelo ejwayelekile ngo-1915. Ngokuphambene nezinye izincazelo ezingokomlando, inkolelo-mbono ekhethekile yobuhlobo iyavumelana nokusheshisa kanye nokusheshisa izinhlaka zokubhekisela.
Ingxenye "ekhethekile" yenkolelo-mbono ka-Einstein ekhethekile yokuhlobana iyinkomba yokuthi iyisimo esikhethekile senkolelo-mbono yakhe ejwayelekile yokuhlobana. I-relativity ekhethekile isebenza kuphela esimweni esikhethekile lapho ukugoba kwesikhala-isikhathi kunganakwa, okungukuthi, isikhala-isikhathi "sicaba". Inkolelo-mbono ekhethekile yokuhlobana kwabantu yaqanjwa ngo-1907, futhi ukuze ivumelane kahle namandla adonsela phansi, u-Einstein wasungula inkolelo-mbono evamile yokuhlobana kwabantu ngo-1915.