# Revision history [back]

Some methods for symbolic expressions have a hold argument, that allows to prevent simplification of expressions. For example:

sage: a = sqrt(2)
sage: a.parent()
Symbolic Ring
sage: a^2
2
sage: a.power(2)
2
sage: a.power(2,hold=True)
sqrt(2)^2


It also works for addition in certain cases:

sage: x.parent()
Symbolic Ring
x + x


Unfortunately, it seems not to work for elements of the Symbolic Ring that represent integers:

sage: a = SR(2)
sage: a.parent()
Symbolic Ring
sage: a
2
5


Some methods for symbolic expressions have a hold argument, that allows to prevent simplification of expressions. For example:

sage: a = sqrt(2)
sage: a.parent()
Symbolic Ring
sage: a^2
2
sage: a.power(2)
2
sage: a.power(2,hold=True)
a.power(2, hold=True)
sqrt(2)^2


It also works for addition in certain cases:

sage: x.parent()
Symbolic Ring
x + x


Unfortunately, it seems not to work for elements of the Symbolic Ring that represent integers:

sage: a = SR(2)
sage: a.parent()
Symbolic Ring
sage: a
2
5


Some methods for symbolic expressions have a hold argument, that this allows to prevent simplification of expressions. For example:

sage: a = sqrt(2)
sage: a.parent()
Symbolic Ring
sage: a^2
2
sage: a.power(2)
2
sage: a.power(2, hold=True)
sqrt(2)^2


It also works for addition in certain cases:

sage: x.parent()
Symbolic Ring
x + x


Unfortunately, it seems not to work for elements of the Symbolic Ring that represent integers:

sage: a = SR(2)
sage: a.parent()
Symbolic Ring
sage: a
2
5


Some methods for symbolic expressions have a hold argument, this allows to prevent simplification of expressions. For example:

sage: a = sqrt(2)
sage: a.parent()
Symbolic Ring
sage: a^2
2
sage: a.power(2)
2
sage: a.power(2, hold=True)
sqrt(2)^2
sage: pi.cos(hold=True)
cos(pi)


It also works for addition in certain cases:

sage: x.parent()
Symbolic Ring

Unfortunately, it seems not to work for elements of the Symbolic Ring that represent integers:
sage: a = SR(2)