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Mar 25, 2015 at 17:07 vote accept Wojowu
Mar 25, 2015 at 17:01 answer added Jason Rute timeline score: 6
Mar 24, 2015 at 22:18 comment added Andreas Blass Emil is right about Simpson's book. In more detail: Stephen G. Simpson, "Systems of Second-Order Arithmetic"
Mar 24, 2015 at 21:17 comment added Emil Jeřábek Though if you want a simple formula, the Wikipedia article mentions that it is equivalent to $\mathrm{ACA}_0 + \Sigma^1_1$-separation.
Mar 24, 2015 at 21:15 comment added Emil Jeřábek Simpson’s book.
Mar 24, 2015 at 20:42 history asked Wojowu CC BY-SA 3.0