Expression of type And

from the theory of proveit.numbers.numerals.decimals

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, a, b, n
from proveit.logic import And, InSet
from proveit.numbers import Digits, greater, one, zero

# build up the expression from sub-expressions
sub_expr1 = Variable("_a", latex_format = r"{_{-}a}")
expr = And(InSet(a, Digits), ExprRange(sub_expr1, InSet(IndexedVar(b, sub_expr1), Digits), one, n), greater(a, zero))

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())

\left(a \in \mathbb{N}^{\leq 9}\right)\land \left(b_{1} \in \mathbb{N}^{\leq 9}\right) \land  \left(b_{2} \in \mathbb{N}^{\leq 9}\right) \land  \ldots \land  \left(b_{n} \in \mathbb{N}^{\leq 9}\right) \land \left(a > 0\right)

stored_expr.style_options()

name	description	default	current value	related methods
operation	'infix' or 'function' style formatting	infix	infix
wrap_positions	position(s) at which wrapping is to occur; '2 n - 1' is after the nth operand, '2 n' is after the nth operation.	()	()	('with_wrapping_at', 'with_wrap_before_operator', 'with_wrap_after_operator', 'without_wrapping', 'wrap_positions')
justification	if any wrap positions are set, justify to the 'left', 'center', or 'right'	center	center	('with_justification',)

# display the expression information
stored_expr.expr_info()

	core type	sub-expressions	expression
0	Operation	operator: 1 operands: 2
1	Literal
2	ExprTuple	3, 4, 5
3	Operation	operator: 15 operands: 6
4	ExprRange	lambda_map: 7 start_index: 8 end_index: 9
5	Operation	operator: 10 operands: 11
6	ExprTuple	14, 18
7	Lambda	parameter: 21 body: 12
8	Literal
9	Variable
10	Literal
11	ExprTuple	13, 14
12	Operation	operator: 15 operands: 16
13	Literal
14	Variable
15	Literal
16	ExprTuple	17, 18
17	IndexedVar	variable: 19 index: 21
18	Literal
19	Variable
20	ExprTuple	21
21	Variable