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Expression of type Lambda

from the theory of proveit.numbers.multiplication

In [1]:
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, ExprRange, Lambda, Variable, n, x
from proveit.logic import And, Equals, InSet
from proveit.numbers import Add, Complex, Mult, Natural, one
In [2]:
# build up the expression from sub-expressions
expr = Lambda([n, x], Conditional(Equals(Add(ExprRange(Variable("_a", latex_format = r"{_{-}a}"), x, one, n)), Mult(x, n)), And(InSet(n, Natural), InSet(x, Complex))))
expr:
In [3]:
# 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
In [4]:
# Show the LaTeX representation of the expression for convenience if you need it.
print(stored_expr.latex())
\left(n, x\right) \mapsto \left\{\left(x +  x +  ..\left(n - 3\right) \times.. +  x\right) = \left(x \cdot n\right) \textrm{ if } n \in \mathbb{N} ,  x \in \mathbb{C}\right..
In [5]:
stored_expr.style_options()
no style options
In [6]:
# display the expression information
stored_expr.expr_info()
 core typesub-expressionsexpression
0Lambdaparameters: 1
body: 2
1ExprTuple25, 27
2Conditionalvalue: 3
condition: 4
3Operationoperator: 5
operands: 6
4Operationoperator: 7
operands: 8
5Literal
6ExprTuple9, 10
7Literal
8ExprTuple11, 12
9Operationoperator: 13
operands: 14
10Operationoperator: 15
operands: 16
11Operationoperator: 18
operands: 17
12Operationoperator: 18
operands: 19
13Literal
14ExprTuple20
15Literal
16ExprTuple27, 25
17ExprTuple25, 21
18Literal
19ExprTuple27, 22
20ExprRangelambda_map: 23
start_index: 24
end_index: 25
21Literal
22Literal
23Lambdaparameter: 28
body: 27
24Literal
25Variable
26ExprTuple28
27Variable
28Variable