Expression of type Lambda

from the theory of proveit.numbers.rounding

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, x, y
from proveit.logic import And, InSet
from proveit.numbers import Floor, Integer, Less, LessEq, Real, one, subtract

# build up the expression from sub-expressions
expr = Lambda([x, y], Conditional(LessEq(Floor(x), subtract(y, one)), And(InSet(x, Real), InSet(y, Integer), Less(x, y))))

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(x, y\right) \mapsto \left\{\left\lfloor x\right\rfloor \leq \left(y - 1\right) \textrm{ if } x \in \mathbb{R} ,  y \in \mathbb{Z} ,  x < y\right..

stored_expr.style_options()

no style options

# display the expression information
stored_expr.expr_info()

	core type	sub-expressions	expression
0	Lambda	parameters: 21 body: 1
1	Conditional	value: 2 condition: 3
2	Operation	operator: 4 operands: 5
3	Operation	operator: 6 operands: 7
4	Literal
5	ExprTuple	8, 9
6	Literal
7	ExprTuple	10, 11, 12
8	Operation	operator: 13 operand: 25
9	Operation	operator: 15 operands: 16
10	Operation	operator: 18 operands: 17
11	Operation	operator: 18 operands: 19
12	Operation	operator: 20 operands: 21
13	Literal
14	ExprTuple	25
15	Literal
16	ExprTuple	26, 22
17	ExprTuple	25, 23
18	Literal
19	ExprTuple	26, 24
20	Literal
21	ExprTuple	25, 26
22	Operation	operator: 27 operand: 29
23	Literal
24	Literal
25	Variable
26	Variable
27	Literal
28	ExprTuple	29
29	Literal