Hello, on page https://www.postgresql.org/docs/current/row-estimation-examples.html - there is a example: selectivity = (1 - null_frac1) * (1 - null_frac2) * min(1/num_distinct1, 1/num_distinct2) = (1 - 0) * (1 - 0) / max(10000, 10000) = 0.0001 in the first string " * min" and in the second " / max" as I understand it isn't correct.
Division is just multiplication by the reciprocal so while the presentation here is inconsistent it is correct. Likewise, the larger a number the smaller its reciprocal, so the change from min to max also works.