Should Matrix Be Bold?

For vectors, matrices and tensors, it is recommended to set the variable itself in boldface (excluding any associated subscripts or superscripts). ... The only general situation where italic is not used for bolded symbols is for vector operators, such as ∇ (nabla), set bold and roman.

Should matrices be bolded?

Matrices are denoted by bold face upper case letters (e.g. H). Matrices of a specific size are denoted by bold face upper case letters with a subscript indicating the size. For example, H2 indicates a 2 × 2 matrix and H2×3 indicates a 2 × 3 matrix. Planes are denoted by a bold face lower case pi (e.g. π).

Should you underline matrices?

A vector us usually lower case with a single underline. A matrix is either capital with a single underline or capital with two underlines.