An orthonormal basis is a specific type of basis used in linear algebra and functional analysis that has two key properties: orthogonality and normalization. 1. **Orthogonality**: Vectors in the basis are orthogonal to each other. Two vectors \( \mathbf{u} \) and \( \mathbf{v} \) are said to be orthogonal if their dot product is zero, i.e.

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