Synthetic topos theory
[004L] Exercise

Let TT be a base type theory. We work in TT. Then the function XmX:SubTopLAMX\mapsto \mathord {\textnormal {\textsf {m}}}_{X}:\mathord {\textnormal {\textsf {SubTop}}}\rightarrow \mathord {\textnormal {\textsf {LAM}}} is an equivalence.