Tikkun Olam

cancelled the ability to write a divorce with his and wife’s ‘new names’ which would then be fraudulently by another woman (and husband) with the same names

husband can’t convene a court to cancel the divorce without his wife or divorce agent present

obligations of support of wives and children aren’t taken from mortgaged property

obligations of support of wives and children aren’t taken from mortgaged property

owner of a ‘half slave’ is compelled to free him totally

people returning lost objects, or admitting to part of a claim of a debt against them which couldn’t have been proven, aren’t forced to swear that they didn’t keep some of what they found or saved

promoting the mitzvah of buying land from non Jews in Israel

prozbul enactment by Hillel

redeeming people who sell themselves or their children to non Jews

remarriage was permitted despite a vow that the husband made

signatures required on a divorce document

we don't overpay for buying Torah scrolls, tefillin, and mezuzos from non Jews, don’t buy from them at all?

we don’t help captives escape because their conditions will worsen

we don’t overpay to redeem captives

witnesses must sign on the divorce document