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Expression of type Lambda

from the theory of proveit.logic.sets.inclusion

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, Lambda, a, b, c, x
from proveit.logic import InSet, Set
from proveit.numbers import one
In [2]:
# build up the expression from sub-expressions
expr = Lambda(x, Conditional(InSet(x, Set(a, one, b, c)), InSet(x, Set(a, one, b))))
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())
x \mapsto \left\{x \in \left\{a, 1, b, c\right\} \textrm{ if } x \in \left\{a, 1, b\right\}\right..
In [5]:
stored_expr.style_options()
no style options
In [6]:
# display the expression information
stored_expr.expr_info()
 core typesub-expressionsexpression
0Lambdaparameter: 9
body: 2
1ExprTuple9
2Conditionalvalue: 3
condition: 4
3Operationoperator: 6
operands: 5
4Operationoperator: 6
operands: 7
5ExprTuple9, 8
6Literal
7ExprTuple9, 10
8Operationoperator: 12
operands: 11
9Variable
10Operationoperator: 12
operands: 13
11ExprTuple15, 16, 17, 14
12Literal
13ExprTuple15, 16, 17
14Variable
15Variable
16Literal
17Variable