What does it mean for something to be at a right angle to something else? There's a euclidean geometric answer to that statement, but it's hardly the only corr

What does it mean for something to be at a right angle to something else? There's a euclidean geometric answer to that statement, but it's hardly the only correct answer. When people use it to mean that they're speaking of two issues that have a range of independent possibilities, it's not wrong to invoke linearly independent bases.