Matric Notation: Underlining for Written Work?

[nokia8650]

When reading textbook, I always find that Matrices tend to be in capital letters and bold. Consequently, I was wondering, when writing them down on paper, should they be underlined (in a similar way to vectors)?

Thanks

 

[Sisplat]

Sometimes they are written with a double underline. This is merely a convention though and there are going to be many others. Write them how you like, so long as you define your notation clearly.

If you want to, you can learn Einstein notation, which is a much more elegant way to notate vectors, matrices and higher rank tensors. This is only advisable once you have got a good hand on the properties of linear algebra though.