Expression of type NamedExprs

from the theory of proveit.logic.equality

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 Lambda, NamedExprs, Variable, a, b, c, d
from proveit.logic import Equals
from proveit.numbers import Add, Exp, frac

# build up the expression from sub-expressions
sub_expr1 = Variable("_a", latex_format = r"{_{-}a}")
expr = NamedExprs(("lambda", Lambda(sub_expr1, Equals(a, Add(b, sub_expr1, Exp(c, d))))), ("${_{-}a}$", frac(c, d)))

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\{ \begin{array}{l}
{\rm lambda}: \left[{_{-}a} \mapsto \left(a = \left(b + {_{-}a} + c^{d}\right)\right)\right]\\
{_{-}a}: \frac{c}{d}\\
\end{array} \right\}

stored_expr.style_options()

no style options

# display the expression information
stored_expr.expr_info()

	core type	sub-expressions	expression
0	NamedExprs	lambda: 1 ${_{-}a}$: 2
1	Lambda	parameter: 13 body: 4
2	Operation	operator: 5 operands: 16
3	ExprTuple	13
4	Operation	operator: 6 operands: 7
5	Literal
6	Literal
7	ExprTuple	8, 9
8	Variable
9	Operation	operator: 10 operands: 11
10	Literal
11	ExprTuple	12, 13, 14
12	Variable
13	Variable
14	Operation	operator: 15 operands: 16
15	Literal
16	ExprTuple	17, 18
17	Variable
18	Variable