Poor grammar in a mathematical paper?

English is not my native language and when I read mathematical papers, sometimes I saw sentences such as

The matrix A has rank ≥ n.

I am wondering if this sentence should be considered as grammatically wrong. I think the correct expression should be

The rank of the matrix A is great than or equal to n.

Are expressions such as "The matrix A has rank ≥ n" considered as acceptable in mathematical papers/theses/textbooks?