A relational database for Microsoft Windows, originally from Borland.

Paradox 5 ran on Microsoft Windows [version?] and provided a graphical environment, a debugger, a data modelling tool, and many "ObjectPAL" commands.

Paradox 7 ran under Windows 95 and Windows NT.



An apparently sound argument leading to a contradiction.

Some famous examples are Russell's paradox and the liar paradox. Most paradoxes stem from some kind of self-reference.

Smarandache Linguistic Paradox.