Common vi of type Function

from the theory of proveit

import proveit
# Automation is not needed when only 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 the special expression
from proveit import vi

# check that the built expression is the same as the stored expression
assert vi == stored_expr
assert vi._style_id == stored_expr._style_id
print("Passed sanity check: vi matches stored_expr")

Passed sanity check: vi matches stored_expr

# Show the LaTeX representation of the expression for convenience if you need it.
print(stored_expr.latex())

v\left(i\right)

stored_expr.style_options()

no style options

# display the expression information
stored_expr.expr_info()

	core type	sub-expressions	expression
0	Operation	operator: 1 operand: 3
1	Variable
2	ExprTuple	3
3	Variable