# Common expressions for the theory of proveit.numbers.number_sets.natural_numbers¶

In [1]:
import proveit
# Prepare this notebook for defining the common expressions of a theory:
%common_expressions_notebook # Keep this at the top following 'import proveit'.
from proveit.numbers.number_sets.natural_numbers.natural import NaturalSet, NaturalPosSet

In [2]:
%begin common

Defining common sub-expressions for theory 'proveit.numbers.number_sets.natural_numbers'
Subsequent end-of-cell assignments will define common sub-expressions
%end_common will finalize the definitions

In [3]:
Natural, NaturalPos = NaturalSet(), NaturalPosSet()

Out[3]:
Natural:
NaturalPos:
In [4]:
%end common

These common expressions may now be imported from the theory package: proveit.numbers.number_sets.natural_numbers