Are three people who ate together obligated to make a zimun, and are they forbidden from separating?

When two people eat together and one knows how to recite Birkat Hamazon but the other does not, may the knowledgeable one fulfill the obligation for the other?

6 opinions

When two people eat together and both know Birkat Hamazon, should each recite it independently or may one recite for both?

3 opinions

When two people eat together, is it a mitzvah to seek a third person in order to create an obligation of zimun?

2 opinions

When may a group of six or more separate into smaller groups for zimun?

4 opinions

May a large group that cannot hear the zimun leader split into smaller groups of three (rather than ten) to facilitate zimun?

4 opinions

When do diners who did not all begin eating together still combine for zimun?

4 opinions across 3 eras

Do riders on animals or people walking while eating join for zimun?

2 opinions

Is zimun performed when eating in a non-Jew's house?

4 opinions