In research papers, should Introduction and Conclusion sections be numbered or non-numbered? What does the scientific paper etiquette suggest? Furthermore, in either case, should they appear in the Table of Contents?
If the answer depends on the research field, please elaborate. I'm in electrical engineering, but do occasionally write mathematical papers as well, so those two fields are personally of highest interest.
On a side note, in case someone confuses it with the Introduction section, I am quite sure that the Abstract section should be non-numbered either way.