Expression of type Conditional

from the theory of proveit.numbers.division

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, w, x, y, z
from proveit.logic import And, Equals, InSet, NotEquals
from proveit.numbers import Complex, frac, subtract

# build up the expression from sub-expressions
expr = Conditional(Equals(frac(subtract(w, x), subtract(y, z)), frac(subtract(x, w), subtract(z, y))), And(InSet(w, Complex), InSet(x, Complex), InSet(y, Complex), InSet(z, Complex), NotEquals(y, z)))

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\{\frac{w - x}{y - z} = \frac{x - w}{z - y} \textrm{ if } w \in \mathbb{C} ,  x \in \mathbb{C} ,  y \in \mathbb{C} ,  z \in \mathbb{C} ,  y \neq z\right..

stored_expr.style_options()

name	description	default	current value	related methods
condition_delimiter	'comma' or 'and'	comma	comma	('with_comma_delimiter', 'with_conjunction_delimiter')

# display the expression information
stored_expr.expr_info()

	core type	sub-expressions	expression
0	Conditional	value: 1 condition: 2
1	Operation	operator: 3 operands: 4
2	Operation	operator: 5 operands: 6
3	Literal
4	ExprTuple	7, 8
5	Literal
6	ExprTuple	9, 10, 11, 12, 13
7	Operation	operator: 15 operands: 14
8	Operation	operator: 15 operands: 16
9	Operation	operator: 20 operands: 17
10	Operation	operator: 20 operands: 18
11	Operation	operator: 20 operands: 19
12	Operation	operator: 20 operands: 21
13	Operation	operator: 22 operands: 23
14	ExprTuple	24, 25
15	Literal
16	ExprTuple	26, 27
17	ExprTuple	45, 28
18	ExprTuple	43, 28
19	ExprTuple	46, 28
20	Literal
21	ExprTuple	44, 28
22	Literal
23	ExprTuple	46, 44
24	Operation	operator: 32 operands: 29
25	Operation	operator: 32 operands: 30
26	Operation	operator: 32 operands: 31
27	Operation	operator: 32 operands: 33
28	Literal
29	ExprTuple	45, 34
30	ExprTuple	46, 35
31	ExprTuple	43, 36
32	Literal
33	ExprTuple	44, 37
34	Operation	operator: 41 operand: 43
35	Operation	operator: 41 operand: 44
36	Operation	operator: 41 operand: 45
37	Operation	operator: 41 operand: 46
38	ExprTuple	43
39	ExprTuple	44
40	ExprTuple	45
41	Literal
42	ExprTuple	46
43	Variable
44	Variable
45	Variable
46	Variable