Site projects:Split set theory into elementary set theory

Method

Patrol the current set theory pages and move any relevant items from set theory to elementary set theory instead. Elementary set theory will be treated as a "different subject" to set theory, this way pages tagged as elementary set theory have no business in the set theory category.

Preparations

• Create an "elementary set theory" subject in the Site:Mathematical subject index
• Make clear notes in the Set Theory (subject) page about the nature of the new Elementary Set Theory (subject) page
• Proceed to migrate/patrol the below pages.