From Projective Geometric Algebra
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A scalar in a geometric algebra is an element having grade 0. Scalars are just ordinary real numbers, and they do not involve any basis vectors.

The basis element representing the unit scalar is denoted by $$\mathbf 1$$, a boldface number one. The unit scalar $$\mathbf 1$$ is the multiplicative identity of the geometric product.

For a general element $$\mathbf a$$, the notation $$a_{\mathbf 1}$$ means the scalar component of $$\mathbf a$$.

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