Is there any part of math that is not used in practice, ever?

While many branches of mathematics find practical applications in various fields, there are some more esoteric or theoretical areas that may not have immediate or direct applications in everyday life or specific industries. Purely abstract concepts, such as certain areas of advanced set theory or abstract algebra, may not have direct practical applications for the average person or even for many professionals in specific fields. However, it's important to note that even seemingly esoteric branches of mathematics can sometimes lead to unexpected applications or insights in the future. Mathematical research often involves exploring the structure and relationships within abstract systems, and this exploration can have unforeseen implications. In general, most areas of mathematics find applications in one form or another, and the development of new mathematical theories can sometimes pave the way for technological advancements or improvements in various fields. Nonetheless, the practical utility of certain highly theoretical branches may not be immediately apparent. read less