Delete my own thread is justified
This site is an open box to the entire world of internet. Consequently, Google does injustifyingly link to Planet PTC. This is not comfortable in the sense that lot of Mathcad visitors don't have an exploitable project, thus leading to incorrect or partially correct answers, which the original poster may prefer to not be misinterpreted by lack of context, which context Google does not link. This bug has been reported and commented but not acknowledged, therefore of no interest to PTC. Delete my own thread is a feature to me, that it does upset other visitors: I don't care.
jmG

