Do we really want to show an integral with such internal symbols?
http://axiom-wiki.newsynthesis.org/SandboxPlex
(1) -> integral(x^x, x)
x
++ %A
(1) | %A d%A
++
(2) -> integral(x^x, x)::OutputForm pretend SExpression
(2) (INTSIGN (NOTHING) x (* (^ %A %A) (CONCAT d %A)))
The internal representation should stay as it is, but the OutputForm
formatters should rather output something like
++ x
| x dx
++
In fact, why is that such an internal form? For sum and product there is
no new internal variable.
(3) -> product(x^x, x)::OutputForm pretend SExpression
(3) (PI x (^ x x))
(4) -> sum(x^x, x)::OutputForm pretend SExpression
(4) (SIGMA x (^ x x))
Ralf
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