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Online Computer Terms Dictionary - A

Anthony Hoare

<person> (C. Anthony R. Hoare, Tony) A computer scientist working on programming languages, especially parallel ones. Hoare was responsible for Communicating Sequential Processes (CSP).

[Did he invent the Hoare powerdomain? Other details?]

(1999-07-22)

Nearby terms: ANSI/SPARC model « ANSI X12 « ANSI Z39.50 « Anthony Hoare » anti-aliasing » antichain » antisymmetric

anti-aliasing

<graphics> A technique used on a grey-scale or colour bitmap display to make diagonal edges appear smoother by setting pixels near the edge to intermediate colours according to where the edge crosses them.

The most common example is black characters on a white background. Without anti-aliasing, diagonal edges appear jagged, like staircases, which may be noticeable on a low resolution display. If the display can show intermediate greys then anti-aliasing can be applied. A pixel will be black if it is completely within the black area, or white if it is completely outside the black area, or an intermediate shade of grey according to the proportions of it which overlap the black and white areas. The technique works similarly with other foreground and background colours.

"Aliasing" refers to the fact that many points (which would differ in the real image) are mapped or "aliased" to the same pixel (with a single value) in the digital representation.

(1998-03-13)

Nearby terms: ANSI X12 « ANSI Z39.50 « Anthony Hoare « anti-aliasing » antichain » antisymmetric » antivirus software

antichain

<mathematics> A subset S of a partially ordered set P is an antichain if,

``` for all x, y in S,  x <= y  =>  x = y

```
I.e. no two different elements are related.

("<=" is written in LaTeX as \subseteq).

(1995-02-03)

Nearby terms: ANSI Z39.50 « Anthony Hoare « anti-aliasing « antichain » antisymmetric » antivirus software » ANTLR

antisymmetric

<mathematics> A relation R is antisymmetric if,

``` for all x and y,  x R y and y R x  =>  x == y.

```
I.e. no two different elements are mutually related.

Partial orders and total orders are antisymmetric. If R is also symmetric, i.e.

``` x R y  =>  y R x

```
then

``` x R y  =>  x == y

```
I.e. different elements are not related.

(1995-04-18)

Nearby terms: Anthony Hoare « anti-aliasing « antichain « antisymmetric » antivirus software » ANTLR » ANU

antivirus software

<tool> Programs to detect and remove computer viruses. The simplest kind scans executable files and boot blocks for a list of known viruses. Others are constantly active, attempting to detect the actions of general classes of viruses. antivirus software should always include a regular update service allowing it to keep up with the latest viruses as they are released.

(1998-02-25)

Nearby terms: anti-aliasing « antichain « antisymmetric « antivirus software » ANTLR » ANU » ANU ML

ANTLR

ANother Tool for Language Recognition

Nearby terms: antichain « antisymmetric « antivirus software « ANTLR » ANU » ANU ML » any key

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