...variable,
These are not anonymous variables.
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...convention
User defined unary or binary operators in the standard PROLOG fashion using op/3 are also supported.

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...caret
In this manual, we take the liberty of placing the caret as an accent for readability
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...parallel
The actual names of variables in the rule being asserted will be internally constructed names but we will use the original ones for clarity
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...eval(V)
Delayed constraints involving eval are treated like nonlinears.

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...usually).
It is however not absolutely safe to interrupt at any time, and occasionally at critical stages an interrupt may cause the system to be internally inconsistent
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...name_overload.
The first two options are similar to that in Quintus Prolog. The last is different.
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...arity
Most PROLOG's use the name/arity convention to specify this but this could be confused with division, hence the two argument form is used
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...use
The operational semantics of dynamic code may vary considerably between different PROLOG systems hence one should not place undue reliance on it.
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...MS/DOS
MS/DOS is a trademark of Microsoft Corporation
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...OS/2.
OS/2 is a trademark of IBM corporation
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...UNIX
UNIX is a trademark of Bell Laboratories.
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Alan Borning
Fri Oct 8 12:51:18 PDT 1999