3 5 0 D O C . 3 6 8 O N U N I F I E D F I E L D T H E O R Y … (3) … (4) where and are abbreviations for the expressions in brackets. These two Furthermore, one obtains by Owing to (2), these two expressions are related to the quantities introduced in (1) by the identity In addition, by applying (5 1.c) to the purely antisymmetric quantities introduced in (1) (whose vanishing is nat- urally not yet presupposed here), one obtains the identity . …, (5) which is constructed analogously to (4). The tensor densities G, H and F are, owing to (2), related by the identity … (6) I then recall the tensor density and the identity that holds for it (cf. (3b) 1.c), … (2) Along with V, we now introduce the generalization of this quantity … (3) where presents an arbitrary, constant number. This quantity fulfills—as can be verified by twofold application of the divergence-commutation relation (5) 1.c— the two identities … (4) … (5) or, if one abbreviates the two expressions in brackets as and , … (4a) … (5a) In general, we use a dash above the symbol to indicate that the corresponding expression was formed using instead of . Making the transition to , which is carried out at the end of the calculations, can then be accom- plished by simply leaving off the dashes. If we now introduce the quantities (or ) defined in (1), which are of course initially not presumed to vanish, one can convince oneself by direct calculation that the identity , … (6) holds, where is defined by (1).[6] V / V – / G / 0 = V / 1 2 V – / H / 0 = G H S S S / 1 2 S – / F / 0 = G H + F 0 – [p. 3] V V / 0 V V – – – V W – = = V/ 1 2 V – / H / 0 = V/ V/ – V// 0 – H G H / 0 G / V// 0 – V V 0 = S S G H – 1 2 --S 0 – S introduced (whose instead se presumed