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Expression of type Equals

from the theory of proveit.numbers.ordering

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 ExprRange, Variable, a, b, c, d, e
from proveit.core_expr_types import Len
from proveit.logic import Equals
from proveit.numbers import Less, LessEq, four, one
In [2]:
# build up the expression from sub-expressions
sub_expr1 = Variable("_a", latex_format = r"{_{-}a}")
expr = Equals(Len(operands = [Less(b, a), LessEq(a, c), Equals(c, d), LessEq(d, e)]), Len(operands = [ExprRange(sub_expr1, sub_expr1, one, four)]))
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(b < a, a \leq c, c = d, d \leq e\right)| = |\left(1, 2, \ldots, 4\right)|
In [5]:
stored_expr.style_options()
namedescriptiondefaultcurrent valuerelated methods
operation'infix' or 'function' style formattinginfixinfix
wrap_positionsposition(s) at which wrapping is to occur; '2 n - 1' is after the nth operand, '2 n' is after the nth operation.()()('with_wrapping_at', 'with_wrap_before_operator', 'with_wrap_after_operator', 'without_wrapping', 'wrap_positions')
justificationif any wrap positions are set, justify to the 'left', 'center', or 'right'centercenter('with_justification',)
directionDirection of the relation (normal or reversed)normalnormal('with_direction_reversed', 'is_reversed')
In [6]:
# display the expression information
stored_expr.expr_info()
 core typesub-expressionsexpression
0Operationoperator: 15
operands: 1
1ExprTuple2, 3
2Operationoperator: 5
operands: 4
3Operationoperator: 5
operands: 6
4ExprTuple7, 8, 9, 10
5Literal
6ExprTuple11
7Operationoperator: 12
operands: 13
8Operationoperator: 17
operands: 14
9Operationoperator: 15
operands: 16
10Operationoperator: 17
operands: 18
11ExprRangelambda_map: 19
start_index: 20
end_index: 21
12Literal
13ExprTuple22, 23
14ExprTuple23, 24
15Literal
16ExprTuple24, 25
17Literal
18ExprTuple25, 26
19Lambdaparameter: 28
body: 28
20Literal
21Literal
22Variable
23Variable
24Variable
25Variable
26Variable
27ExprTuple28
28Variable