# Difference between U and U(t)

If I have

```
t = var('t')
U = function('U', t).function(t)
```

what is the difference between the expression *U* and *U(t)*. When should I use which?

Difference between U and U(t)

If I have

```
t = var('t')
U = function('U', t).function(t)
```

what is the difference between the expression *U* and *U(t)*. When should I use which?

0

Asked: **
2011-07-30 13:38:30 -0500
**

Seen: **172 times**

Last updated: **Sep 16 '11**

Defining symbolic functions in Sage and importing from Maxima

automatic substitution within functions?

Maximize nonlinear function with linear constraints

Differentiating Complex Conjugated Functions

min(x,y)=x ... and then plot3d f(x,y)=min(x,y)

How to properly declare indeterminates so that they exist in the coefficient ring.

define/generate new variables automatically

How to dynamically substitute a variable in a callable function?

Copyright Sage, 2010. Some rights reserved under creative commons license. Content on this site is licensed under a Creative Commons Attribution Share Alike 3.0 license.

Here is a similar question, tell us if the answers there are useful for you: http://ask.sagemath.org/question/555/difference-between-f-and-fr