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Expression of type Lambda

from the theory of proveit.logic.sets.intersection

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, m, x
from proveit.core_expr_types import A_1_to_m
from proveit.logic import Forall, InSet, Intersect, NotInSet
from proveit.logic.sets import x_notin_some_A
from proveit.numbers import NaturalPos
In [2]:
# build up the expression from sub-expressions
expr = Lambda(m, Conditional(Forall(instance_param_or_params = [x, A_1_to_m], instance_expr = NotInSet(x, Intersect(A_1_to_m)), condition = x_notin_some_A), InSet(m, NaturalPos)))
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())
m \mapsto \left\{\forall_{x, A_{1}, A_{2}, \ldots, A_{m}~|~\left(x \notin A_{1}\right) \lor  \left(x \notin A_{2}\right) \lor  \ldots \lor  \left(x \notin A_{m}\right)}~\left(x \notin \left(A_{1} \cap  A_{2} \cap  \ldots \cap  A_{m}\right)\right) \textrm{ if } m \in \mathbb{N}^+\right..
In [5]:
stored_expr.style_options()
no style options
In [6]:
# display the expression information
stored_expr.expr_info()
 core typesub-expressionsexpression
0Lambdaparameter: 27
body: 2
1ExprTuple27
2Conditionalvalue: 3
condition: 4
3Operationoperator: 5
operand: 9
4Operationoperator: 7
operands: 8
5Literal
6ExprTuple9
7Literal
8ExprTuple27, 10
9Lambdaparameters: 11
body: 12
10Literal
11ExprTuple30, 23
12Conditionalvalue: 13
condition: 14
13Operationoperator: 28
operands: 15
14Operationoperator: 16
operands: 17
15ExprTuple30, 18
16Literal
17ExprTuple19
18Operationoperator: 20
operands: 21
19ExprRangelambda_map: 22
start_index: 26
end_index: 27
20Literal
21ExprTuple23
22Lambdaparameter: 34
body: 24
23ExprRangelambda_map: 25
start_index: 26
end_index: 27
24Operationoperator: 28
operands: 29
25Lambdaparameter: 34
body: 31
26Literal
27Variable
28Literal
29ExprTuple30, 31
30Variable
31IndexedVarvariable: 32
index: 34
32Variable
33ExprTuple34
34Variable