The book first provides the necessary theoretical background, which includes the covariant derivative, the vector potential, and invariance in coordinate transformation. This is followed by descriptions of global gauge invariance (isotropy), and of local gauge invariance (anisotropy). Sections on time reversal symmetry, reflection invariance, and invariance of finite amplitude waves round out the coverage.
![Gauge Invariance Approach to Acoustic Fields Gauge Invariance Approach to Acoustic Fields](https://www.angusrobertson.com.au/images/0031/9789811387500.jpg?width=250)
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