Community Tip - You can change your system assigned username to something more personal in your community settings. X
How do I type x_dot and x_dotdot?
I don't seem to see those two characters on ASCII maps.
...and when I try to use ' or " , Mathcad places brackets and some other symbol
You need to use a combining diacritical mark. See this thread: http://communities.ptc.com/message/162180#162180
