The way to handle that is whitespace: i != 0. (I once was teased by my tendency to put whitespace in computer code around all operators which would be spaced in typeset mathematical formulas.)
EDIT: I also use italics for variables, boldface for vectors, etc. when handwriting. Whenever I get a new pen I immediately check whether it’s practical to do boldface with it.
The way to handle that is whitespace:
i != 0. (I once was teased by my tendency to put whitespace in computer code around all operators which would be spaced in typeset mathematical formulas.)EDIT: I also use italics for variables, boldface for vectors, etc. when handwriting. Whenever I get a new pen I immediately check whether it’s practical to do boldface with it.