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In the theory of computation, a branch of theoretical computer science, a pushdown automaton (PDA) is a type of automaton that employs a stack. Pushdown automata are used in theories about what can be computed by machines.
The Palm TX. A personal digital assistant (PDA) is a multi-purpose mobile device which functions as a personal information manager. Following a boom in the 1990s and 2000s, PDAs were mostly displaced by the widespread adoption of more highly capable smartphones, in particular those based on iOS and Android in the late 2000s, and thus saw a rapid decline.
The Palm TX from 2005 An early model—the PalmPilot Personal. Palm is a now discontinued line of personal digital assistants (PDAs) and mobile phones developed by California-based Palm, Inc., originally called Palm Computing, Inc. Palm devices are often remembered as "the first wildly popular handheld computers," responsible for ushering in the smartphone era.
Personal digital assistants (PDAs) are handheld devices that were originally designed as personal organizers, but became much more versatile over the years. A basic PDA usually includes a clock, date book, address book, task list, memo pad and a simple calculator .
In 2017, a team of original Psion engineers created a startup company, Planet Computers, to make an Android device in a similar form factor, the Gemini (PDA). The Cosmo Communicator is a development of this device, enhancements including an external touchscreen on the rear of the clamshell lid, mainly to facilitate use as a mobile phone without ...
Palm, Inc., was an American company that specialized in manufacturing personal digital assistants (PDAs) and developing software. Palm designed the PalmPilot, [1] the first PDA successfully marketed worldwide, and was known for the Treo 600, one of the earlier successful smartphones.
Sharp Zaurus SL-5500 running OpenZaurus and OPIE, with docking cradle and stylus. Sharp Zaurus is a series of personal digital assistants (PDAs) made by Sharp Corporation.The Zaurus was the most popular PDA during the 1990s in Japan and was based on a proprietary operating system.
As an example they are (effectively) closed under complementation, but not closed under union. To prove that the complement of a language accepted by a deterministic PDA is also accepted by a deterministic PDA is tricky because one has to avoid infinite computations and correctly handle transitions that manipulate the stack without reading ...