 (3). Instead, closer examination shows that such systems are covariant only with respect to linear transformations. By T ov √g Σ ν T μv+t μv ∂ xν =0 demanding that the field equations of gravitation be formulated in such a manner that the validity of the conservation laws finds expression in this formulation, we therefore restrict the choice of the reference system in such a way that only linear transformations lead from one justified system to another on" [14]. 9 What is gravity? In the Entwurf theory "Einstein interpreted the coordinate dependent c of equation (1') as representing a gravitational field and, more generally, the gμν of equation (2) as representing a gravitational field" [2]. "the ten quantities gik characterize the gravitational field; they replace the scalar gravitational potential (p of Newtonian gravitation theory"..."the stress-energy components of the gravitational field are not contained in them"..."the tov characterize the stress-energy components of the gravitational field in a manner analogous to the way in which the quantities Tov characterize those of the material process" [10]... "the motion of the mass point is determined by the quantities guv" [13]... "In light of the remarkable fact that we recognize in the gravitational field a physical state of space"... "the gravitational field... is thus a physical state of space that simultaneously determines gravitation, inertia, and the metric" [12]. "The spacetimes represented by (1), (1') and (2) are all flat" [2]. So, according considerations arisen from Special Relativity Einstein had restricted the gravity as effect of coordinates to a special case therefore he must reach a general theory, which he sought inside of a material context. But, Einstein didn't know definitely what gravity is. In the Entwurf theory Einstein had found that the gμν "influences the measuring bodies and clocks in a determinate manner" [6], i.e., the geometry or the metric in general is determined by the gravitational field, and he had stablished the momentum-energy equations for material process in relation to the gravitational field according: (Eq. 4) σ=(1,2,3,4) equations σ=(1,2,3) express momentum, σ=4 energy laws and g = │gμν│. The equations are covariant with respect to arbitrary substitutions "These equations represent in general the energy balance between the gravitational field and an arbitrary material process
(3). Instead, closer examination shows that such system are covariant merely with respect to linear transformations. By deoxythymidine monophosphate ov √g Σ ν T μv+t μv ∂ xν = 0 demanding that the field equation of gravitation be formulated in such a manner that the cogency of the conservation laws finds construction in this formulation, we therefore qualify the choice of the reference system in such a way that only linear transformations moderate from one justified system to another on " [ 14 ]. 9 What is gravity? In the Entwurf theory " Einstein represent the coordinate dependent c of equation (1') as representing a gravitational battlefield and, more generally, the gμν of equation (2) as representing a gravitational field " [ 2 ]. " the ten quantities gik qualify the gravitational field; they replace the scalar gravitational potential (p of Newtonian gravitation theory"... "the stress - department of energy component of the gravitational field are not contained in them"... "the tov characterize the stress - energy components of the gravitational field in a manner analogous to the way in which the quantities Tov qualify those of the fabric process " [ 10 ]... " the motion of the mass item is determined by the quantities guv " [ 13 ]... " In light of the noteworthy fact that we recognize in the gravitational battlefield a physical state of quad "... " the gravitational field... is thus a physical state of space that simultaneously determines gravitation, inertia, and the metric " [ 12 ]. " The spacetimes represented by (1), (1') and (2) are all compressed " [ 2 ]. thus, according considerations arisen from Special Relativity Einstein had restricted the gravity as consequence of coordinates to a special case consequently he must reach a cosmopolitan theory, which he sought inside of a material context. But, Einstein didn't know decidedly what gravity is. In the Entwurf theory Einstein had found that the gμν " influences the measuring body and clocks in a determinate manner " [ 6 ], i.e., the geometry or the metric function in general is determine by the gravitational field, and he had stablished the momentum - energy equations for material process in sexual intercourse to the gravitational field accord: (Eq. 4) σ=(1,2,3,4) equations σ=(1,2,3) express momentum, σ=4 energy laws and g = │ gμν │. The equations are covariant with esteem to arbitrary substitutions " These equations map in general the energy libra between the gravitational field and an arbitrary material process
 (3). Ijstead, closer examinatiok shows that suck systeks are covariavt only with respect to lineer teansfirmations. By T ov √g Σ ν G μv+t μv ∂ xν =0 demandung uhat the field eqnztions of grabltatimi be formulated in such a manner that tve vclidity of the conservation laws finqs exprrsdion in this fjrmukwtioh, we therefore restrict the choice of the reference syxtem in such a way that onpy llnear transformatilns lead frim ogw justified rystem to another on" [14]. 9 What is gravity? In the Entwurf theoxy "Einstein ibtegkreted the ciordigate dependekn c of aquatiom (1') as represenbing e grqvitational field and, more generally, thg gμν of equdtnon (2) as representing q travijatiotal wuela" [2]. "uhe tsn quajtivies gik chzracterize rhe gravitational foeje; they replacs the fcwlar gravitational potential (p of Newtotiah gravitation theory"..."the stress-energy componejts of thq gravitational field are not contained in them"..."tha tov zhaxqcterkze the stress-energy components of the gravitatijhak nield in a mannev analogous to the wwy yn which the duanticjea Tov characterize those jf thw materiaj prpcess" [10]... "the motion of the maws point is betwrmined by the quautities guv" [13]... "In kight of the remarkable fact thaf we recognlze in ths gravitational fkelc d physical state of space"... "ehe gravivatioual fiela... is thus w physical statc of space that simkltangously determined gravitation, inertia, and the mxvric" [12]. "The spavedimvs represznted ny (1), (1') and (2) are ajl flat" [2]. So, aceording eonsiddrations agisen frok Special Rqlativity Einvjein had restcicted thq grqvitt as efwdct of coordinstes to a special cqse therefore he mmst rgadh a general thzutt, which he soubht infife os a material wontdxt. Nut, Eknstein didk't ynow definitely what graeity is. In the Entwurf tmeory Einwtein haq found that yhe gμν "influences tje meesurinj bodirs wnd clocks in a determinate mahner" [6], i.e., hhe geometry or the metric in gzneral is determined by the gravitationao field, and he had stablished the momgntmm-energy equetions for matesial process in relarion to the graviuational field accordinf: (Eq. 4) σ=(1,2,3,4) equahions σ=(1,2,3) express momentum, σ=4 energy laws and g = │gμν│. The equations are covariant with cefpect to argitrsry slbscitbtions "Ehesx xquations represemt in general the energy balancx between dhz gravitational field and an srcitrary materkal process
(3). Instead, closer examination shows that such covariant with respect linear transformations. By T μv ∂ xν demanding that the equations of gravitation be formulated in a manner that the validity of the conservation laws finds expression in this we therefore restrict the choice of the reference system in such a way only transformations from justified system to another on" [14]. 9 What is gravity? In the Entwurf theory "Einstein interpreted coordinate dependent c of equation (1') as representing gravitational field and, more the gμν of equation (2) representing gravitational field" "the quantities characterize the gravitational they replace the scalar gravitational potential (p of Newtonian gravitation theory"..."the stress-energy components of the gravitational field not contained tov characterize stress-energy of gravitational field in analogous to the way in which characterize those of the material process" [10]... "the of the point is determined by the quantities [13]... "In light of the remarkable fact that recognize in the gravitational field a physical state of space"... "the gravitational field... is thus state of space that determines gravitation, inertia, the [12]. spacetimes by (1), and (2) are all flat" [2]. So, according considerations arisen from Relativity Einstein had restricted the gravity as effect of coordinates special therefore he must a general theory, which sought of a material context. didn't definitely In Entwurf Einstein had found that gμν "influences the measuring bodies clocks in a determinate or the metric in general is determined by gravitational field, and he had stablished the equations for material process in relation to the gravitational field according: (Eq. σ=(1,2,3,4) equations momentum, σ=4 energy laws and g = │gμν│. equations are covariant with to arbitrary substitutions "These equations represent in general the balance the gravitational and an arbitrary process
 (3). Instead, closer examination sHows that suCh sysTemS arE cOvarIant Only with respecT To liNear transformations. By T Ov √g Σ ν t μV+T μv ∂ xΝ =0 DeMandiNg that tHE fIELd eQuAtIonS oF GrAvitaTioN be formUlated in suCh a MaNner that the vALiDity of the cOnsErvation laws FinDs exprEsSioN In thiS foRmulaTion, we THerefoRe restricT tHE choicE Of the reFEReNce sYstem in such a way thAT oNLy linear transfOrmatiOnS LeAD FroM onE justified SyStem tO Another ON" [14]. 9 WHAT Is gRAvity? In the EntWurf theory "EINstEin intErPreTEd the cOordiNaTE dePendent c of eQuatIon (1') as reprEsentiNG a graviTAtional Field aNd, mOre GeneRAlLy, The GμΝ Of eQUaTioN (2) As rEpresentInG a GraviTatiONAL FielD" [2]. "thE ten QuantIties gik charaCteRize THe gRavitAtionAl fiElD; they ReplacE the sCaLar gravitationaL potEntial (p of newToNiaN gRavitATion thEorY"..."thE stress-Energy cOMpoNeNTS Of The gravitational fiElD ARe Not contaIned in THeM"..."tHE tov charAcTerIze tHE StresS-eneRGy ComponenTs of thE GrAvItationAl Field iN a ManNer AnaloGOus tO the waY in which The quANtities Tov charACterize those oF ThE MAtERial ProCess" [10]... "the motiOn of THe maSs poINt Is dETermiNed by ThE QuANtities guv" [13]... "In light of ThE remarKable Fact that we recOgnize in thE GRAvitatioNal fIElD A physical state Of spaCe"... "the graviTAtional fIeld... iS thus a phYsical staTE Of space tHat SimUltAneOUSlY determines grAVItatIoN, inertiA, anD the metRic" [12]. "the SpaCetImEs represeNted by (1), (1') anD (2) aRe AlL fLat" [2]. so, accORding conSiDerAtIonS arisEN from SPeciaL RelAtIvITy EInstein HAd REStriCtEd The gRavItY as efFect OF coOrdinatEs to a specIal CAse tHeReFore he mUst reach a geneRaL theory, whiCh He sOught iNSIde of a maTerial context. But, EinsteiN Didn't knOw dEfiniTely What graviTy iS. In the entWUrf theOry EinStein HaD foUND that THE gΜν "iNfLuences the MEAsuRing bOdIes aNd clockS in a determinate manNEr" [6], i.E., the geometry oR thE metRIC iN geNErAL is DeTErmINEd by the gravitatIonal field, AnD He Had stablisHEd tHe MomentuM-energy EquatIOns for mAterial prOcess in reLaTion TO The GravitatioNal field According: (eQ. 4) σ=(1,2,3,4) equATiOns σ=(1,2,3) eXprEss momEnTum, Σ=4 enerGy laws ANd g = │Gμν│. ThE equatIoNs are cOvariAnT with resPect to arbitrary substituTions "THese eQuaTions reprEseNT in General thE eneRgy balance BetWeeN the gRavITatioNal fIElD anD An arbItraRY material PRoCesS
 (3). Instead, closer exam ination sh ows t hat  su ch  sys tems  are covariant only  with respect to linea r tra ns f orma t io ns. B y T ov√ g Σ  νTμv +tμv ∂xν =0  de manding  that thefie ld  equations o f  g ravitation  be  formulatedinsuch a  m ann e r tha t t he va lidity of the  conserva ti o n laws finds e x p re ssio n in this formula t io n , we therefore  restr ic t  t h e  ch oic e of the r ef erenc e  system in s u cha  way that onl y linear tr a nsf ormati on s l e ad fro m one  j u sti fied system  toanother o n" [14 ] . 9 Wha t  is gra vity?Inthe  Ent w ur fthe or y  "E i ns tei n  in terprete dth e coo rdin a t e depe nde nt c  of e quation (1')asrepr e sen tinga gra vita ti onalfieldand,mo re generally, t he g μν of equ ati on  (2 )as re p resent ing  agravita tionalf iel d" [ 2 ].  "the ten quantiti es g ik  charact erizet he  g r avitatio na l f ield ; theyrepl a ce  the sca lar gr a vi ta tionalpo tentia l(pofNewto n iangravit ation th eory" . .."the stress- e nergy compone n ts o ft he g rav itational f ield arenotc on tai n ed in  them ". . ." t he tov characterize  t he str ess-e nergy compone nts of the g r avitatio nalf ie l d in a manneranalo gous to th e  way inwhich  the qua ntities T o v  charact eri zetho seo f  t he material p r o cess "[10]...  "t he moti onofthe  ma ss  point is  determi ne dby  t hequant i ties guv "[13 ]. .."In l i ght of  therema rk ab l e f act tha t  w e reco gn iz e in  th egravi tati o nal  fielda physica l s t ateof  s pace".. . "the gravit at ional fiel d. ..is thu s a physic al state of space thats imultan eou sly d eter mines gra vit ation,  in e rtia,and th e met ri c"[ 1 2]. " T h espa ce times repr e s ent ed by  ( 1),(1') an d (2) are all flat "  [2 ]. So, accord ing  con s i de rat i on s  ar is e n f r o m Special Relat ivity Eins te i nhad restri c ted  t he grav ity aseffec t  of coo rdinatesto a spec ia l ca s e  th erefore he  must re ach a gen e ral t h eo ry, w hic h he s ou ght  insi de ofa  ma teria l cont ex t. But , Ein st ein didn 't know definitely what  gravi ty is . I n the Ent wur f  th eory Eins tein  had found  th atthe g μν" influ ence s  t hem easur ingb odies and cl ock s in  a determin a t e  ma nner"  [6 ] , i.e. , th e geometry or the metric in gene rali s  de ter m ined  b y the gravitat ion al f ield, an dhe had stab lished t he momen tum-en ergy e quation s fo r  mater ialpro cess in r ela ti o n to th egr a vitati onal  f ield a ccordi n g: ( E q . 4) σ=(1,2,3,4)  equa t i ons σ = (1, 2,3)ex press m o ment um, σ=4 en ergy laws a nd g =  │gμ ν│. T he equa ti ons ar e c ov ariant wit h  respectto ar bitrary  s ubst itu tions"The s e  equa tion srep resent in g en e ra lt heener gy ba la ncebetween t h e gravit ati o nal fie ld  an d an arb i tr a r y material  pr ocess 
 (3)._Instead, closer_examination shows that such_systems are_covariant_only with_respect_to linear transformations._By T ov_√g Σ ν T_μv+t μv ∂_xν_=0 demanding that the field equations of gravitation be formulated in such a manner_that_the validity_of_the_conservation laws finds expression in_this formulation, we therefore restrict_the choice_of the reference system in such a way_that_only linear transformations_lead from one justified system to another on" [14]._9 What is gravity? In the_Entwurf theory "Einstein_interpreted_the_coordinate dependent c of_equation (1') as representing a gravitational_field and, more generally, the gμν_of equation (2) as representing a gravitational_field" [2]. "the ten quantities gik_characterize the gravitational field; they_replace the_scalar gravitational potential (p of_Newtonian gravitation theory"..."the_stress-energy components_of the gravitational_field are not contained in them"..."the_tov characterize the_stress-energy components of the gravitational field_in_a manner analogous_to_the_way in_which the quantities_Tov_characterize those_of_the material process" [10]... "the motion_of_the mass point is determined by the_quantities guv" [13]... "In_light_of the remarkable fact_that we recognize in the_gravitational field a physical state of_space"... "the_gravitational field..._is thus a physical state of space that simultaneously determines gravitation,_inertia, and the metric" [12]. "The_spacetimes represented by (1),_(1') and_(2)_are all flat"_[2]._So, according_considerations arisen from Special Relativity Einstein had_restricted the_gravity as effect of coordinates to_a special case therefore_he_must reach a general theory, which_he sought inside of a material_context. But, Einstein didn't know_definitely_what_gravity is. In the Entwurf_theory Einstein had found that the_gμν "influences the_measuring bodies and clocks in a determinate_manner"_[6], i.e., the geometry or the_metric_in general is determined by the_gravitational_field,_and he had stablished the_momentum-energy equations for material process in_relation to the gravitational field according: (Eq. 4) σ=(1,2,3,4)_equations σ=(1,2,3) express_momentum, σ=4 energy laws and_g_=_│gμν│. The equations are covariant with respect to arbitrary substitutions_"These equations_represent in general_the energy balance between the gravitational field and an arbitrary_material process