Suppose I have a vector $\mathbf{a}=a_x\mathbf{\hat e}_x+a_y\mathbf{\hat e}_y+a_z\mathbf{\hat e}_z$. I want to write $\mathbf{a}$ with parentheses and without the unit vectors. Should I write $$ \mathbf{a}=(a_x,a_y,a_z) $$ or $$ \mathbf{a}(a_x,a_y,a_z)=(a_x,a_y,a_z) $$?
Are there any differences?
Thanks!