Number of explainers and learners

This page classifies learning situations by the number of explainers (e.g. teachers) and number of learners (e.g. students) present. Each learning situation can be visualized as a directed graph where an arrow from $A$ to $B$ ($A \to B$) means "$A$ explains to $B$".

Number of explainers	Number of learners	Condition on identity of explainers and learners	Examples
one	one	the explainer is not the learner	one-on-one tutoring
one	one	explainer is the learner	self-studying, solitary original research
one	many	the explainer is not one of the learners	classroom learning, textbook, blog post explaining an idea, one tutor with many students
one	many	explainer is one of the learners	a group of students studying together and one of them is explaining something, a student-teacher who teaches a class and is simultaneously learning how to teach
many	one	the learner is not an explainer	parents explaining something to a child
many	one	the learner is also an explainer but there are other explainers who are not the learner	an autodidact who also receives guidance from a tutor nearby
many	many	none of the explainers are a learner	classroom with multiple teachers, textbook with multiple authors
many	many	each explainer is also a learner	a mutual exchange of information in a conversation, collaborative original research
many	many	some of the explainers are not learners, some of the explainers are learners	a classroom with one teacher and one-student-teacher who take turns teaching