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Expression of type Lambda

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.
%load_expr # Load the stored expression as 'stored_expr'
# import Expression classes needed to build the expression
from proveit import Conditional, ConditionalSet, Lambda, x, y
from proveit.logic import And, Equals, InSet
from proveit.numbers import Max, Real, greater, greater_eq
In [2]:
# build up the expression from sub-expressions
expr = Lambda([x, y], Conditional(Equals(Max(x, y), ConditionalSet(Conditional(x, greater_eq(x, y)), Conditional(y, greater(y, x)))), And(InSet(x, Real), InSet(y, Real))))
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\{{\rm Max}\left(x, y\right) = \left\{\begin{array}{ccc}x \textrm{ if } x \geq y \\ y \textrm{ if } y > x\end{array}\right.. \textrm{ if } x \in \mathbb{R} ,  y \in \mathbb{R}\right..
In [5]:
stored_expr.style_options()
no style options
In [6]:
# display the expression information
stored_expr.expr_info()
 core typesub-expressionsexpression
0Lambdaparameters: 26
body: 1
1Conditionalvalue: 2
condition: 3
2Operationoperator: 4
operands: 5
3Operationoperator: 6
operands: 7
4Literal
5ExprTuple8, 9
6Literal
7ExprTuple10, 11
8Operationoperator: 12
operands: 26
9Operationoperator: 13
operands: 14
10Operationoperator: 16
operands: 15
11Operationoperator: 16
operands: 17
12Literal
13Literal
14ExprTuple18, 19
15ExprTuple27, 20
16Literal
17ExprTuple28, 20
18Conditionalvalue: 27
condition: 21
19Conditionalvalue: 28
condition: 22
20Literal
21Operationoperator: 23
operands: 24
22Operationoperator: 25
operands: 26
23Literal
24ExprTuple28, 27
25Literal
26ExprTuple27, 28
27Variable
28Variable