# from the theory of proveit.logic.equality¶

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.
# import Expression classes needed to build the expression
from proveit import a, b, c, d
from proveit.logic import And, Equals

In [2]:
# build up the expression from sub-expressions
expr = And(Equals(a, b), Equals(b, c), Equals(c, d))

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(a = b\right) \land \left(b = c\right) \land \left(c = d\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',)
as_total_orderingWhen 'True', style the conjunction as a total ordering (e.g. x < y < z from (x < y) and (y < z))NoneNone/False('with_total_ordering_style',)
In [6]:
# display the expression information
stored_expr.expr_info()

core typesub-expressionsexpression
0Operationoperator: 1
operands: 2
1Literal
2ExprTuple3, 4, 5
3Operationoperator: 8
operands: 6
4Operationoperator: 8
operands: 7
5Operationoperator: 8
operands: 9
6ExprTuple10, 11
7ExprTuple11, 12
8Literal
9ExprTuple12, 13
10Variable
11Variable
12Variable
13Variable