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Expression of type ExprTuple

from the theory of proveit.logic.equality

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, ExprTuple, Lambda, P, Px, Py, x, y
from proveit.logic import And, Equals
In [2]:
# build up the expression from sub-expressions
expr = ExprTuple(Lambda([P, x, y], Conditional(Px, And(Py, 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(\left(P, x, y\right) \mapsto \left\{P\left(x\right) \textrm{ if } P\left(y\right) ,  x = y\right..\right)
In [5]:
stored_expr.style_options()
no style options
In [6]:
# display the expression information
stored_expr.expr_info()
 core typesub-expressionsexpression
0ExprTuple1
1Lambdaparameters: 2
body: 3
2ExprTuple11, 15, 16
3Conditionalvalue: 4
condition: 5
4Operationoperator: 11
operand: 15
5Operationoperator: 7
operands: 8
6ExprTuple15
7Literal
8ExprTuple9, 10
9Operationoperator: 11
operand: 16
10Operationoperator: 13
operands: 14
11Variable
12ExprTuple16
13Literal
14ExprTuple15, 16
15Variable
16Variable