In this post I learned that single letter macros purportedly have a significant impact on the typesetting process. For the past n many years I have been redefining letters like '\d', '\x', '\z', and '\e' because of the ubiquity of corresponding mathematical symbols. My questions are
- What is the real purpose of the symbols? Why isn't my PDF corrupted, and
- what is the real harm in redefining them if its not really messing with anything?