Expression of type Lambda

from the theory of proveit.linear_algebra.tensors

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 Conditional, Lambda, i, y
from proveit.linear_algebra import ScalarMult
from proveit.logic import InSet
from proveit.numbers import Add, Interval, Mult, four, one, two

# build up the expression from sub-expressions
expr = Lambda(i, Conditional(ScalarMult(Mult(i, Add(i, one)), y), InSet(i, Interval(two, four))))

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())

i \mapsto \left\{\left(i \cdot \left(i + 1\right)\right) \cdot y \textrm{ if } i \in \{2~\ldotp \ldotp~4\}\right..

stored_expr.style_options()

no style options

# display the expression information
stored_expr.expr_info()

	core type	sub-expressions	expression
0	Lambda	parameter: 21 body: 2
1	ExprTuple	21
2	Conditional	value: 3 condition: 4
3	Operation	operator: 5 operands: 6
4	Operation	operator: 7 operands: 8
5	Literal
6	ExprTuple	9, 10
7	Literal
8	ExprTuple	21, 11
9	Operation	operator: 12 operands: 13
10	Variable
11	Operation	operator: 14 operands: 15
12	Literal
13	ExprTuple	21, 16
14	Literal
15	ExprTuple	17, 18
16	Operation	operator: 19 operands: 20
17	Literal
18	Literal
19	Literal
20	ExprTuple	21, 22
21	Variable
22	Literal