An elementary treatise on the differential calculus, in which the method of limits is exclusively made use of, by the Rev. M. O’Brien.

Hey folks, check out this deal on 'An elementary treatise on the differential calculus' by M. O'Brien on Amazon. It's down to $22.3 from $32.9, saving you 32%! If you're looking to really understand the foundations of calculus using the method of limits, this book is a solid choice. Sometimes going back to the basics with a good explanation can make all the difference, and this one seems to offer just that. It's a classic for a reason, so if you're into math or studying it, this is a steal.