# from the theory of proveit.numbers.ordering¶

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 Conditional, Lambda, x, y
from proveit.logic import And, Equals, InSet
from proveit.numbers import LessEq, Real

In [2]:
# build up the expression from sub-expressions
expr = Lambda([x, y], Conditional(LessEq(x, y), And(InSet(x, Real), InSet(y, Real), Equals(x, y))))

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(x, y\right) \mapsto \left\{x \leq y \textrm{ if } x \in \mathbb{R} ,  y \in \mathbb{R} ,  x = y\right..

In [5]:
stored_expr.style_options()

no style options
In [6]:
# display the expression information
stored_expr.expr_info()

core typesub-expressionsexpression
0Lambdaparameters: 14
body: 1
1Conditionalvalue: 2
condition: 3
2Operationoperator: 4
operands: 14
3Operationoperator: 5
operands: 6
4Literal
5Literal
6ExprTuple7, 8, 9
7Operationoperator: 11
operands: 10
8Operationoperator: 11
operands: 12
9Operationoperator: 13
operands: 14
10ExprTuple16, 15
11Literal
12ExprTuple17, 15
13Literal
14ExprTuple16, 17
15Literal
16Variable
17Variable