Background field method: Alternative way of deriving the pinch technique's results.

We show that the background field method (BFM) is a simple way of deriving the same gauge-invariant results which are obtained by the pinch technique (PT). For illustration we construct gauge-invariant selfenergy and three-point vertices for gluons at one-loop level by BFM and demonstrate that we get the same results which were derived via PT. We also calculate the four-gluon vertex in BFM and show that this vertex obeys the same Ward identity that was found with PT. HUPD-9408 YNU-HEPTh-94-104 May 1994 Supported in part by the Monbusho Grant-in-Aid for Scientific Research No. 040011. Supported in part by the Monbusho Grant-in-Aid for Scientific Research No. C-05640351. Supported in part by the Monbusho Grant-in-Aid for Scientific Research No. 050076. e-mail address: [email protected]