The inverse problem can be formulated as follows:

- Data→ Model parameters Eq. 1

**Inverse modelling** is a term applied to describe the group of methods used to gain information about a physical system based on observations of that system. In other words, it is an attempt to solve the inverse problem.

**d**=**Gm**Eq. 2

Non-linear inverse problems have a more complex relationship between data and model, represented by the equation:

**d**=**G**(**m**) Eq. 3

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