Using a single quote, e.g. Git commit refs in the documentation

Question

For example, this question has the following diagram

M1  - M2 - M3
   \         \
    \         \
     A1 - A2   A1' - A2'

What is the syntax in A1 and A2, i.e. A1'and A2', in this context?

Answer 1

It is a symbol borrowed from mathematical derivative notation .

A1', , A1 M3. , , ( rebase), (A1' parent M1 A1' parent is M3), , , commit. A1' A1, .

Answer 2

, , rebued . A1 A1' , . A1 A2 M3.

' prime ". A1' , A1. A1' " ".