# from the theory of proveit.linear_algebra.addition¶

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 ExprTuple, a, b
from proveit.linear_algebra import Norm
from proveit.numbers import Add, Exp, frac, one, two

In [2]:
# build up the expression from sub-expressions
expr = ExprTuple(Add(Exp(Norm(a), two), Exp(Norm(b), two)), frac(one, two))

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(\left \|a\right \|^{2} + \left \|b\right \|^{2}, \frac{1}{2}\right)

In [5]:
stored_expr.style_options()

namedescriptiondefaultcurrent valuerelated methods
wrap_positionsposition(s) at which wrapping is to occur; 'n' is after the nth comma.()()('with_wrapping_at',)
justificationif any wrap positions are set, justify to the 'left', 'center', or 'right'leftleft('with_justification',)
In [6]:
# display the expression information
stored_expr.expr_info()

core typesub-expressionsexpression
0ExprTuple1, 2
1Operationoperator: 3
operands: 4
2Operationoperator: 5
operands: 6
3Literal
4ExprTuple7, 8
5Literal
6ExprTuple9, 15
7Operationoperator: 11
operands: 10
8Operationoperator: 11
operands: 12
9Literal
10ExprTuple13, 15
11Literal
12ExprTuple14, 15
13Operationoperator: 17
operand: 19
14Operationoperator: 17
operand: 20
15Literal
16ExprTuple19
17Literal
18ExprTuple20
19Variable
20Variable