G
o
o
g
l
e
×
Please click
here
if you are not redirected within a few seconds.
All
Images
Videos
News
Maps
Shopping
Books
Search tools
Any time
Any time
Past hour
Past 24 hours
Past week
Past month
Past year
All results
All results
Verbatim
Elementary class
In model theory, a branch of mathematical logic, an elementary class is a class consisting of all structures satisfying a fixed first-order theory.
Wikipedia