mathwonk said:try eulers elements of algebra
Many classic mathematical treatises can be found in print at your local library or university library. These institutions usually have a dedicated section for mathematical texts and may also offer interlibrary loan services if they don't have a specific treatise in their collection.
Yes, many classic mathematical treatises are available for free online through websites such as Project Gutenberg or Internet Archive. Some may also be available for purchase through e-book retailers like Amazon or Barnes and Noble.
Yes, there are several websites and databases that focus specifically on classic mathematical treatises, such as the Mathematical Association of America's Digital Library and the Cornell University Library's Historical Math Monographs collection.
If a treatise is rare or out-of-print, it may be more difficult to access. Your best bet would be to check with specialized libraries or institutions, such as the Clay Mathematics Institute or the National Institute of Standards and Technology, which may have a collection of rare mathematical texts.
While it may be uncommon, there are some physical stores that specialize in selling rare and out-of-print books, including classic mathematical treatises. These stores may be more prevalent in larger cities and can often be found through a quick online search.