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Expression of type Equals

from the theory of proveit.logic.sets.membership

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 a
from proveit.logic import Equals, InSet, Or, Set
from proveit.numbers import Add, one, three
In [2]:
# build up the expression from sub-expressions
sub_expr1 = Add(one, three)
expr = Equals(InSet(a, Set(one, sub_expr1, three)), Or(Equals(a, one), Equals(a, sub_expr1), Equals(a, three))).with_wrapping_at(2)
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())
\begin{array}{c} \begin{array}{l} \left(a \in \left\{1, 1 + 3, 3\right\}\right) =  \\ \left(\left(a = 1\right) \lor \left(a = \left(1 + 3\right)\right) \lor \left(a = 3\right)\right) \end{array} \end{array}
In [5]:
stored_expr.style_options()
namedescriptiondefaultcurrent valuerelated methods
operation'infix' or 'function' style formattinginfixinfix
wrap_positionsposition(s) at which wrapping is to occur; '2 n - 1' is after the nth operand, '2 n' is after the nth operation.()(2)('with_wrapping_at', 'with_wrap_before_operator', 'with_wrap_after_operator', 'without_wrapping', 'wrap_positions')
justificationif any wrap positions are set, justify to the 'left', 'center', or 'right'centercenter('with_justification',)
directionDirection of the relation (normal or reversed)normalnormal('with_direction_reversed', 'is_reversed')
In [6]:
# display the expression information
stored_expr.expr_info()
 core typesub-expressionsexpression
0Operationoperator: 16
operands: 1
1ExprTuple2, 3
2Operationoperator: 4
operands: 5
3Operationoperator: 6
operands: 7
4Literal
5ExprTuple19, 8
6Literal
7ExprTuple9, 10, 11
8Operationoperator: 12
operands: 13
9Operationoperator: 16
operands: 14
10Operationoperator: 16
operands: 15
11Operationoperator: 16
operands: 17
12Literal
13ExprTuple22, 18, 23
14ExprTuple19, 22
15ExprTuple19, 18
16Literal
17ExprTuple19, 23
18Operationoperator: 20
operands: 21
19Variable
20Literal
21ExprTuple22, 23
22Literal
23Literal