# from the theory of proveit.numbers.logarithms¶

In [1]:
import proveit
# Automation is not needed when building an expression:
proveit.defaults.automation = False # This will speed things up.
proveit.defaults.inline_pngs = False # Makes files smaller.
# import Expression classes needed to build the expression
from proveit import ExprTuple, a, b
from proveit.logic import InSet, NotEquals
from proveit.numbers import RealPos, one

In [2]:
# build up the expression from sub-expressions
expr = ExprTuple(InSet(a, RealPos), InSet(b, RealPos), NotEquals(a, one))

Out[2]:
expr:
In [3]:
# check that the built expression is the same as the stored expression
assert expr == stored_expr
assert expr._style_id == stored_expr._style_id
print("Passed sanity check: expr matches stored_expr")

Passed sanity check: expr matches stored_expr

In [4]:
# Show the LaTeX representation of the expression for convenience if you need it.
print(stored_expr.latex())

\left(a \in \mathbb{R}^+, b \in \mathbb{R}^+, a \neq 1\right)

In [5]:
stored_expr.style_options()

Out[5]:
namedescriptiondefaultcurrent valuerelated methods
wrap_positionsposition(s) at which wrapping is to occur; 'n' is after the nth comma.()()('with_wrapping_at',)
justificationif any wrap positions are set, justify to the 'left', 'center', or 'right'leftleft('with_justification',)
In [6]:
# display the expression information
stored_expr.expr_info()

Out[6]:
core typesub-expressionsexpression
0ExprTuple1, 2, 3
1Operationoperator: 5
operands: 4
2Operationoperator: 5
operands: 6
3Operationoperator: 7
operands: 8
4ExprTuple11, 10
5Literal
6ExprTuple9, 10
7Literal
8ExprTuple11, 12
9Variable
10Literal
11Variable
12Literal