I find that this website is a great reference for learning more about the basics of proof writing. It goes through, in detail, the fundamentals of direct proofs, proving the contrapositive, and proof by contradiction. Furthermore, it provides examples of such proofs, which are fairly easy to follow. Visiting this site is a great way to become familiar with the different forms of proof.
I believe that this website gives great tips that will enhance your proof writing abilities. In particular, following the advice provided in this site will ensure that your proofs meets all of the formalities required of proof writing. Although this site may at times seems to be overly formal, on the whole I believe that it is a great referencing tool for beginning proof writers.
I consider Wolfram Alpha to be one of the best online tools for mathematicians. This website is ideal for performing a wide variety of calculations. For instance, this website can solve simple algebraic equations, compute prime factorizations, compute truth tables, and much more. The site also serves as a math dictionary, and allows you to research famous math problems. All these properties make this site a great reference when writing proofs.
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