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Abstract-There exists a multitude of location-sensing systems utilizing wireless technology, though varying in cost, coverage and accuracy. In this paper we will introduce WLocator, a system that aims to strike a balance between these areas. WLocator will provide location information relative to symbolic, user-created "landmarks". These landmarks are easily created and maintained, thus reducing short and long term costs. Additionally, the unique matching algorithm invoked by WLocator attempts to offer a relatively high level of accuracy, given the low cost of implementing the system.

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The Becchi–Rouet–Stora (BRS) invariance of quantum electrodynamics in the nonlineart' Hooft–Veltman gauge ∂∙A + λA2 = 0 is examined. It is the longitudinal contribution to the vacuum polarization in the t' Hooft–Veltman gauge that upholds BRS invariance.

The Ward–Takahashi–Slavnov–Taylor (WTST) identities are examined in the 't Hooft–Veltman gauge ∂∙A + λA2 = 0. It is found that gauge invariance implies that there is a contribution to the longitudinal part of the vacuum polarization that is proportional to λ.