 a material field" [20]. "according to the general theory of relativity, gravitation occupies an exceptional position with regard to other forces, particularly the electromagnetic forces, since the ten functions representing the gravitational field at the same time define the metrical properties of the space measure" "We make a distinction hereafter between "gravitational field" and "matter" in this way, that we denote everything but the gravitational field as "matter." Our use of the word therefore includes not only matter in the ordinary sense, but the electromagnetic field as well" [21]. Einstein returning to a point back in time in the line of development of his works on gravitation really constituted a leap in which he has also break with Minkowski's spacetime model based on Euclidean geometry since it is not support general covariance and he adhered to the general Riemannian geometry where the differences in mass concentration within a cosmic distribution cause a non-homogeneous curvature in spacetime, with the greater curvature where the mass concentration is greater; thus, due general covariance of General Relativity, too Einstein had renounced to the Minkowski geometry [22]. Let's remember, the Riemann tensor, also named tidal force tensor, gives the spacetime curvature. If in a given lapse of spacetime, all the components of the curvature tensor vanish then that lapse spacetime is flat [11]. As in 1918, Emmy Noether showed that the symmetry of Minkowski space tensor is the cause of conservation of energy-momentum of a physical field and "Schrodinger (1918) showed that the mathematical object suggested by Einstein in his final general relativity for describing the energy-momentum of the gravity field may be made vanish by a coordinate transformation for the Schwarzschild solution if that solution is transformed to Cartesian coordinates. Bauer (1918) pointed out that Einstein's energy-momentum object, when calculated for a flat space-time but in a curvilinear system of coordinates, leads to a nonzero result. In other words, can be zero when it should not be, and can be nonzero when it should. Einstein (1918) replied that already Nordstrom had informed him about this problem with tμν. Einstein noted that in his theory tμν is not a tensor and also it is not symmetric. He also withdrew his previous demand of the necessity to have an energy-momentum tensor: "There may very well be gravitational fields without stress and energy density" [20]. In fact, Einstein and Grossmann (1913) came close to Noether's result when they wrote: "remarkably the conservation laws allow one
a material field " [ 20 ]. " according to the general hypothesis of relativity, gravity fill an exceptional placement with attentiveness to other forces, peculiarly the electromagnetic forces, since the ten functions representing the gravitational battlefield at the same time specify the metrical properties of the distance meter " " We make a differentiation hereafter between " gravitational field " and " topic " in this way, that we denote everything but the gravitational field as " topic. " Our use of the word therefore includes not only topic in the ordinary common sense, but the electromagnetic field as well " [ 21 ]. Einstein returning to a point back in fourth dimension in the line of development of his works on gravitation really form a leap in which he has also break with Minkowski's spacetime model based on Euclidean geometry since it is not support general covariance and he adhered to the general Riemannian geometry where the difference in mass concentration within a cosmic distribution induce a non - homogeneous curvature in spacetime, with the great curvature where the bulk concentration is greater; thus, due general covariance of General Relativity, too Einstein had renounced to the Minkowski geometry [ 22 ]. lease's remember, the Riemann tensor, also named tidal force tensor, gives the spacetime curvature. If in a given backsliding of spacetime, all the components of the curvature tensor vanish then that lapse spacetime is flat [ 11 ]. As in 1918, Emmy Noether show that the isotropy of Minkowski quad tensor is the cause of conservation of energy - momentum of a physical field and " Schrodinger (1918) indicate that the mathematical object suggested by Einstein in his concluding general relativity for report the energy - momentum of the gravity playing field may be made vanish by a coordinate transformation for the Schwarzschild solution if that solution is transform to Cartesian coordinates. Bauer (1918) pointed out that Einstein's department of energy - momentum object, when calculated for a flat space - clock time but in a curvilinear system of coordinate, leads to a nonzero result. In other password, can be zero when it should not be, and can be nonzero when it should. Einstein (1918) replied that already Nordstrom had inform him about this problem with tμν. Einstein notice that in his theory tμν is not a tensor and also it is not symmetric. He also withdrew his former demand of the necessity to have an energy - momentum tensor: " There may very well be gravitational field without stress and energy density " [ 20 ]. In fact, Einstein and Grossmann (1913) came close to Noether's result when they wrote: " signally the conservation laws allow one
 a laterial field" [20]. "accordinn to the general theory of remativity, gravitation occupies an excxptiinal kjsition with regara to otheg forces, partmcularly the elerfromagnccic fkvces, vmnce the ten fukctions repsesenting the crxvntational field at the same time defyne the mftrical properjies ps ths space measure" "We make a distinctjon hertafter between "grafitational field" and "matteg" in this way, that we fenote everifhigt but the grxvitational field as "mztter." Our use of the word therewore nncludes noj knpi matter in vhe orqinary sense, but the electrpmagnetic fielc av wwll" [21]. Einstein returniig to a point back ig time in tke line of developmenr if hiv wosks ub gfavjtetikn reaply constitutsd a leap ib which he has also bwvsk with Minkkwski's s[acetime model based on Euclidean geomeury sjnce it is not support teneral covariance anf he adhewed to the general Riemannian geometry where the giffecevcew ln mxws concentration within a cosmic distribution cwhst a non-homogeneouf curvature ij xkacetime, with jhe grecfed curvature where hhe masf conxentratiog is greater; thus, due general civariance of Teneral Relativity, too Einstenn had renoinced to the Minkowski yeometdy [22]. Let's relember, ths Riemann tensor, xlsp tamed tidal force tensor, gyves the wpacztime cufvatore. If yn a given lapsc of spacetime, all hhe clm[onents of the curvature tensor vanish thxi that lapse xpdcenime is fjat [11]. Ss in 1918, Emmy Njether showed jhat the fymmegry of Miniowski vpace tensow is the causa of conservavion of egergt-momwntum ow a physical firld and "Sbhxodinger (1918) showed that the metheoztical object sbygtsred by Einsteim iv hys fmnal daneral relathvith fut deszribing the dnerby-momentum of the grdvitg field may be madr yanish by a coordynate transfotmation for the Scjwarzvchmld sokutyon if that solution is transfkrmed to Farbesian coordigatew. Bauer (1918) poiuted out that Einstein's energy-momentum ouject, when calculated fir a flat space-time nut in a curtilinewr system of coordinates, leadw to a nonzero rexult. In other words, czn be sero ahen it should not be, and can be nonzero when it should. Einstein (1918) replied that elweady Nordsfrom had pnfjxmed hii ablnt this problem wpth tμν. Einstein noted that in his theory dμν ns not a tensor and also it ix vot symmetric. He also withdrew his prsvious drmand of the necessity to have sn energy-momentum tensor: "There mqy vedy well be gravitational fiekds wichout wtress qnd cnergy density" [20]. Im nact, Einstfin end Grossmann (1913) came close to Noethee's resylh when they wrotx: "remarkably uhe conaervatyon laws allow ohe
a material field" [20]. "according to the of gravitation occupies exceptional position with the forces, since the functions representing the field at the same time define metrical properties of the space measure" "We make a distinction hereafter between "gravitational and "matter" in this way, that we denote everything but the gravitational field "matter." use the therefore includes not only matter in the ordinary sense, but the electromagnetic field as well" [21]. returning to a point back in time in line of development of works on gravitation really constituted leap which he also with spacetime model based Euclidean geometry since it is not support general covariance and he adhered to the general Riemannian geometry the differences concentration within cosmic cause non-homogeneous curvature in the greater curvature where the mass thus, due general covariance of General Relativity, too had renounced the Minkowski geometry [22]. Let's remember, Riemann tensor, also named tidal force tensor, gives spacetime curvature. If in a given lapse of spacetime, all the components of the curvature then that lapse spacetime flat [11]. As 1918, Noether that symmetry of space tensor is the cause of conservation of energy-momentum of a field and "Schrodinger (1918) showed that the mathematical object suggested in final general relativity describing the energy-momentum of gravity may be made vanish coordinate for if solution transformed to Cartesian coordinates. (1918) pointed out that Einstein's object, when calculated for a curvilinear system of coordinates, leads to a result. In other words, can be zero it should not be, and can be nonzero when it should. Einstein replied that had informed him about this problem with tμν. noted that in his tμν is not a tensor and also it is symmetric. also withdrew previous demand of necessity to have energy-momentum tensor: "There well be fields stress [20]. In fact, Einstein and Grossmann came to Noether's result when they "remarkably laws allow one
 a material field" [20]. "according to The general TheorY of RelAtIvitY, graVitation occupiES an eXceptional position with RegarD tO OtheR FoRces, pArticulARlY THe eLeCtRomAgNEtIc forCes, Since thE ten functiOns RePresenting thE GrAvitationaL fiEld at the same TimE definE tHe mETricaL prOpertIes of tHE space Measure" "We MaKE a distINction hEREaFter Between "gravitatioNAl FIeld" and "matter" iN this wAy, THaT WE deNotE everythinG bUt the GRavitatIOnAL FIelD As "matter." Our usE of the word tHEreFore inClUdeS Not onlY mattEr IN thE ordinary seNse, bUt the elecTromagNEtic fieLD as well" [21]. einsteIn rEtuRninG To A pOinT bACk iN TiMe iN The Line of deVeLoPment Of hiS WORKs on GraVitaTion rEally constituTed A leaP In wHich hE has aLso bReAk witH MinkoWski's SpAcetime model basEd on euclidean GeoMeTry SiNce it IS not suPpoRt gEneral cOvarianCE anD hE ADHeRed to the general RieMaNNIaN geometrY where THe DiFFerences In MasS conCENtratIon wIThIn a cosmiC distrIBuTiOn cause A nOn-homoGeNeoUs cUrvatURe in SpacetIme, with tHe greATer curvature whERe the mass concENtRATiON is gReaTer; thus, due gEnerAL covAriaNCe Of GENeral relatIvITy, TOo Einstein had renounCeD to the minkoWski geometry [22]. LEt's remembeR, THE Riemann TensOR, aLSo named tidal foRce teNsor, gives tHE spacetiMe curVature. If In a given lAPSe of spacEtiMe, aLl tHe cOMPoNents of the curVATure TeNsor vanIsh Then thaT laPse SpaCetImE is flat [11]. As In 1918, Emmy NoEtHeR sHoWed That tHE symmetrY oF MiNkOwsKi spaCE tensoR is thE cauSe Of COnsErvatioN Of ENErgy-MoMeNtum Of a PhYsicaL fieLD anD "SchrodInger (1918) showEd tHAt thE mAtHematicAl object suggeStEd by EinsteIn In hIs finaL GEneral reLativity for describing thE Energy-mOmeNtum oF the Gravity fiEld May be mAde VAnish bY a coorDinatE tRanSFOrmatION fOr tHe schwarzschILD soLutioN iF thaT solutiOn is transformed to CARteSian coordinatEs. BAuer (1918) POInTed OUt THat eiNSteIN'S energy-momentum Object, when CaLCuLated for a fLAt sPaCe-time bUt in a cuRviliNEar systEm of coordInates, leaDs To a nONZerO result. In oTher wordS, can be zerO When iT ShOuld nOt bE, and caN bE noNzero When it SHouLd. EinStein (1918) rEpLied thAt alrEaDy NordstRom had informed him about tHis proBlem wIth Tμν. EinsteIn nOTed That in his TheoRy tμν is not A teNsoR and aLso IT is noT symMEtRic. hE also WithDRew his preVIoUs dEMAnD of the necesSITY to Have aN enERgy-momEntuM tensor: "There may veRY well be gravitaTionAL FieLds WIthoUt Stress and energY deNsITY" [20]. In fact, EInStein and GroSsmann (1913) caMe CLose tO NoethEr's resUlt when THEy WRote: "reMarkAblY the conseRvaTiON laws alLoW oNE
 a material field" [20]. " accordingto th e g ene ra l th eory  of relativity ,  gra vitation occupies an e xcept io n al p o si tionwith re g ar d toot he r f or c es , par tic ularlythe electr oma gn etic forces, si nce the te n f unctions rep res enting  t heg ravit ati onalfielda t thesame time  d e fine t h e metri c a lprop erties of the spa c em easure" "We ma ke a d is t in c t ion  he reafter be tw een " g ravitat i on a l fie l d" and "matte r" in thisw ay,  thatwe  de n ote ev eryth in g  bu t the gravi tati onal fiel d as " m atter." Our use  of th e w ord  the r ef or e i nc l ude s  n oto nly  matterin  t he or dina r y s ense , b ut t he el ectromagnetic  fi elda s w ell"[21].  Ein st ein r eturni ng to  a  point back intime  in the l ine  o f d ev elopm e nt ofhis  wo rks ongravita t ion  r e a l ly  constituted a lea pi n  w hich hehas al s obr e ak withMi nko wski ' s  spac etim e  m odel bas ed onE uc li dean ge om etry s in ceitis no t  sup port g eneral c ovari a nce and he adh e red to the ge n er a l  R i eman nia n geometrywher e  the  dif f er enc e s inmassco n ce n tration within a co sm ic dis tribu tion cause anon-homoge n e o us curva ture in spacetime, wit h the  greater c u rvaturewhere  the mas s concent r a tion isgre ate r;thu s ,  d ue general co v a rian ce  of Gen era l Relat ivi ty,  to o E in stein had  renounc ed  t oth e M inkow s ki geome tr y [ 22 ].Let's rememb er, t he R ie ma n n t ensor,a ls o name dti dalfor ce  tens or,g ive s the s pacetimecur v atur e.  I f in agiven lapse o fspacetime,  a llthe co m p onents o f the curvature tensorv anish t hen  that  lap se spacet ime  is fl at[ 11]. A s in 1 918,Em myN o ether s ho wed  t hat the sy m m etr y ofMi nkow ski spa ce tensor is the c a use  of conservat ion  ofe n er gy- m om e ntu mo f a p hysical field a nd "Schrod in g er  (1918) sh o wed  t hat the  mathem atica l  object  suggeste d by Eins te in i n his  final gen eral rel ativity f o r des c ri bingthe  energ y- mom entum  of th e  gr avity  field  m ay bemadeva nish bya coordinate transforma tion f or th e S chwarzsch ild sol ution ifthat  solutionistra nsfor med to Ca rtes i an  co o rdina tes. Bauer (19 1 8)  po i n te d out thatE i n ste in'sene r gy-mom entu m object, when ca l culated for aflat s pac e-t i me b ut  in a curvilin ear  s y s tem of c oo rdinates, l eads toan onzer o resu lt. In  otherw o rd s , canbe z ero  when itsho ul d  not be ,an d  can b e no nz ero wh en its houl d .  Einstein (1918)  repl i e d tha t  al ready  N ordstro m  had  informedhim about t his pr oble m wit h tμν.Ei nstein  no te d that inh is theory  tμνis notatens orand al so i t is no t sy mm etr ic. He al s o  w i th dr e w h is p revio us  dem and of th e  necessi tyt o havean  en e r gy-mom e nt u m  tensor: " The re ma y very wellb e gr a vi t ation al fie lds wi thout s t res sand ene rgy d ensity" [ 20]. In f a ct,  E inst ein andGr ossm an n ( 19 13) came closeto Noeth er's res u l t when  th e y wr o te: "r em arkably theconse rv a tion la w s  al low one 
 a_material field"_[20]. "according to the_general theory_of_relativity, gravitation_occupies_an exceptional position_with regard to_other forces, particularly the_electromagnetic forces, since_the_ten functions representing the gravitational field at the same time define the metrical properties_of_the space_measure"_"We_make a distinction hereafter between_"gravitational field" and "matter" in_this way,_that we denote everything but the gravitational field_as_"matter." Our use_of the word therefore includes not only matter in_the ordinary sense, but the electromagnetic_field as well"_[21]._Einstein_returning to a point_back in time in the line_of development of his works on_gravitation really constituted a leap in which_he has also break with Minkowski's_spacetime model based on Euclidean_geometry since_it is not support general_covariance and he_adhered to_the general Riemannian_geometry where the differences in mass_concentration within a_cosmic distribution cause a non-homogeneous curvature_in_spacetime, with the_greater_curvature_where the_mass concentration is_greater;_thus, due_general_covariance of General Relativity, too Einstein_had_renounced to the Minkowski geometry [22]. Let's_remember, the Riemann tensor,_also_named tidal force tensor,_gives the spacetime curvature. If_in a given lapse of spacetime,_all the_components of_the curvature tensor vanish then that lapse spacetime is flat [11]._As in 1918, Emmy Noether showed_that the symmetry of_Minkowski space_tensor_is the cause_of_conservation of_energy-momentum of a physical field and "Schrodinger_(1918) showed_that the mathematical object suggested by_Einstein in his final_general_relativity for describing the energy-momentum of_the gravity field may be made_vanish by a coordinate transformation_for_the_Schwarzschild solution if that solution_is transformed to Cartesian coordinates. Bauer_(1918) pointed out_that Einstein's energy-momentum object, when calculated for_a_flat space-time but in a curvilinear_system_of coordinates, leads to a nonzero_result._In_other words, can be zero_when it should not be, and_can be nonzero when it should. Einstein (1918) replied_that already Nordstrom_had informed him about this_problem_with_tμν. Einstein noted that in his theory tμν is not_a tensor_and also it_is not symmetric. He also withdrew his previous demand of_the necessity to have an energy-momentum tensor:_"There may very well be gravitational fields without stress and energy_density" [20]. In fact, Einstein and Grossmann (1913)_came close to Noether's result when they_wrote: "remarkably the conservation_laws_allow one