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Expression of type Equals

from the theory of proveit.linear_algebra.tensors

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 ExprRange, IndexedVar, Variable, x
from proveit.linear_algebra import TensorProd
from proveit.logic import Equals
from proveit.numbers import one, three, two
In [2]:
# build up the expression from sub-expressions
sub_expr1 = Variable("_a", latex_format = r"{_{-}a}")
expr = Equals(TensorProd(ExprRange(sub_expr1, IndexedVar(x, sub_expr1), one, three)), TensorProd(IndexedVar(x, one), IndexedVar(x, two), IndexedVar(x, 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(x_{1} {\otimes}  x_{2} {\otimes}  \ldots {\otimes}  x_{3}\right) =  \\ \left(x_{1} {\otimes} x_{2} {\otimes} x_{3}\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: 1
operands: 2
1Literal
2ExprTuple3, 4
3Operationoperator: 6
operands: 5
4Operationoperator: 6
operands: 7
5ExprTuple8
6Literal
7ExprTuple9, 10, 11
8ExprRangelambda_map: 12
start_index: 17
end_index: 19
9IndexedVarvariable: 20
index: 17
10IndexedVarvariable: 20
index: 18
11IndexedVarvariable: 20
index: 19
12Lambdaparameter: 22
body: 16
13ExprTuple17
14ExprTuple18
15ExprTuple19
16IndexedVarvariable: 20
index: 22
17Literal
18Literal
19Literal
20Variable
21ExprTuple22
22Variable