I do not know if it is the right section to ask for it, but I wanted to ask some questions about math symbols that I often find on automation books. One of these is the following: $$\not\ge$$ This symbol means no greater or equal, but what sense does it have? Why use this and not less "<" ?
Instead, this other symbol I think I do not know the exact meaning so I ask you for a confirmation: $$\gneq$$ Means greater than and at least one equal? Does it mean that if I basically compare two vectors, the first one must have elements greater than the second and must contain at least one equal?