Question about HP-15C Integrals

[brouhaha]

The 34C and 15C can use solve together with integrate, but unfortunately you can't use nested solves or nested integrations. This is largely because these calculators have one one set of internal solve variables and one set of internal integration variables. In the 34C those are in dedicated internal memory, while in the 15C the necessary space is allocated from the "pool".

Of HP caluclators, AFAIK only the RPL models (28, 48, 49, 50) can do nested solve or nested integration.

The 71B Math module can do nested solve and integrate as well, to a depth of five, but I don't generally consider the 71B as a calculator.