Fermi
·
Concept Library
·
Courses
·
Books
·
Problems
·
Simulations
·
Math Wiki
·
High School
Fermi
›
Problems
Mathematics
Mathematics
Problem
Explain in one concise sentence why, in general,
a
−
b
≠
b
−
a
\mathbf{a}-\mathbf{b}\neq\mathbf{b}-\mathbf{a}
a
−
b
=
b
−
a
.
Browse the problem library