  We present the full form of a four-point correlation function of large BPS
operators in planar N = 4 Super Yang-Mills to any loop order. We do this by
following a bootstrap philosophy based on three simple axioms pertaining to (i)
the space of functions arising at each loop order, (ii) the behaviour in the
OPE in a double-trace dominated channel and (iii) the behaviour under a double
null limit. We discuss how these bootstrap axioms are in turn strongly
motivated by empirical observations up to nine loops unveiled through
integrability methods in our previous work [9] on this simplest correlation
function.
