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## Main Question or Discussion Point

Hello, I basically want to know more about the founding axioms, set theory and get a grasp of the foundations. Any suggestions?

Doing a quick search, I have found a free ebook by Kenneth Kunen, http://www.math.wisc.edu/~kunen/770.html, does anyone know of it?

Although I would very much prefer freely available (text)books, recommendations of paid ones are also welcome.

Thank you very much!

Doing a quick search, I have found a free ebook by Kenneth Kunen, http://www.math.wisc.edu/~kunen/770.html, does anyone know of it?

Although I would very much prefer freely available (text)books, recommendations of paid ones are also welcome.

Thank you very much!