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Go through Euclid's Elements (i.e. http://aleph0.clarku.edu/~djoyce/elements/bookI/bookI.html)
Read the definitions and then prove all the postulates yourself, in order.
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Go through Euclid's Elements (i.e. http://aleph0.clarku.edu/~djoyce/elements/bookI/bookI.html)
Read the definitions and then prove all the postulates yourself, in order.