Questions:Direct factor

This is a questions page on direct factor, listing common questions that may occur both to people encountering the definition for the first time and to people who have spent some time with the definition.

In addition to reading these questions, you should read: direct factor (the main page on the topic), internal direct product, external direct product, and equivalence of internal and external direct product.

Also see facts about direct factor, facts that prove that a subgroup is a direct factor, and facts that use that a subgroup is a direct factor.