Hello! I am thirteen and *very* interested in mathematics.(adsbygoogle = window.adsbygoogle || []).push({});

I've done calculus 1-3, some ODE's, and some linear algebra. I just started into basic real analysis (while completing linear algebra/ODE's), and the problems are *really* tough. I can solve a good number of the problems, but some I can't; how can I build up my skills in this area? Are there any problems online (preferably with answers)?

I'm using Kolmogorov and Fomin'sIntroductory Real Analysis. Thanks.

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# Some advice please ?

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