All of maths, from the lowly 1+1 to Fermat's last theorem proof; numbers are abstract and do not exist in the real world. In general, look into the analytic-sy

All of maths, from the lowly 1+1 to Fermat's last theorem proof; numbers are abstract and do not exist in the real world. In general, look into the analytic-synthetic distinction: https://en.wikipedia.org/wiki/Analytic%E2%80%93synthetic_distinction https://en.wikipedia.org/wiki/Analytic%E2%80%93synthetic_dis...