Expression of type ExprArray

from the theory of proveit.core_expr_types.expr_arrays

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, B, C, D, E, ExprArray, ExprRange, F, IndexedVar, Variable, i, j

# build up the expression from sub-expressions
sub_expr1 = Variable("_a", latex_format = r"{_{-}a}")
expr = ExprArray([ExprRange(sub_expr1, IndexedVar(B, sub_expr1), i, j), A, B, C], [D, E, F, ExprRange(sub_expr1, IndexedVar(D, sub_expr1), i, j)])

expr:

# 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

# Show the LaTeX representation of the expression for convenience if you need it.
print(stored_expr.latex())

ExprArray\left(\begin{array}{c} \left(B_{i}, B_{i + 1}, \ldots, B_{j}, A, B, C\right),  \\ \left(D, E, F,D_{i}, D_{i + 1}, \ldots, D_{j}\right) \end{array}\right)

stored_expr.style_options()

name	description	default	current value	related methods
justification	justify to the 'left', 'center', or 'right' in the array cells	center	center	with_justification

# display the expression information
stored_expr.expr_info()

	core type	sub-expressions	expression
0	ExprTuple	1, 2
1	ExprTuple	3, 4, 15, 5
2	ExprTuple	16, 6, 7, 8
3	ExprRange	lambda_map: 9 start_index: 11 end_index: 12
4	Variable
5	Variable
6	Variable
7	Variable
8	ExprRange	lambda_map: 10 start_index: 11 end_index: 12
9	Lambda	parameter: 18 body: 13
10	Lambda	parameter: 18 body: 14
11	Variable
12	Variable
13	IndexedVar	variable: 15 index: 18
14	IndexedVar	variable: 16 index: 18
15	Variable
16	Variable
17	ExprTuple	18
18	Variable