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Summary of the notations.
| Symbol | Meaning |
|---|---|
| X | Census features |
| p = |X| | The number of observations |
| k | Size of the lattice |
| σ | The neighbourhood parameter |
| Θ | The learning rate |
| Ψ | The lateral distance |
| ξ | Best Matching Unit |
| lNi | Position of the ith neuron on the lattice |
