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Tagged with semantic-matching expression-manipulation
3 questions
1
vote
3
answers
162
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How to keep a specific expression unevaluated?
For example, I define some quantities here
$$
\gamma=\frac1{\sqrt{1-\frac{r^2}{c^2 t^2}}}, \qquad \mbox{with} \; r^2=x^2+y^2+z^2.
$$
Now I want to calculate some expressions. Let's say, $\partial_t \...
- 409
4
votes
4
answers
193
views
How to use replacement rules in a named expression before a sub-expression evaluates?
I have a named expression: expr := a + b. a and b are also named expressions.
Let's say <...
0
votes
1
answer
195
views
