# Translations:Wavelets - book/20/en

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What is a zero-point reverse of a wavelet? It is possible to consider wavelets with complex coefficients - that is, coefficients of the form *u* + *iv*, where *u*, *v* are real numbers and . An example is the wavelet (*i*, 0.5), where *i* is the coefficient at time index 0 and where 0.5 is the coefficient at time index 1. Another example is the wavelet (2 + *i*, 1–*i*, *i*), where 2 +*i* is the coefficient at time index 0, where 1 – *i* is the coefficient at time index 1, and where *i* is the coefficient at time index 2.