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How to reuse facts by means of modules in Alloy


How to reuse facts by means of modules in Alloy

By : ryan
Date : November 18 2020, 11:13 AM
Hope this helps In my previous answer I tried to address your "similarly between different signature" point, that is, I thought your main goal was to have a module that somehow enforces that there is a field named isA in the sig associated with parameter Q, and that isA is both injective and surjective. I realize now that what you probably want is reusable predicates that assert that a given binary relation is injective/sujective; this you can achieve in Alloy:
library/copy.als
code :
module copy [Domain, Range]

pred inj[rel: Domain -> Range] {
  all c1,c2: Domain | c1.rel=c2.rel => c1=c2   // injective mapping
}

pred surj[rel: Domain -> Range] {
  all a1: Range | some c1: Domain | c1.rel=a1   //surjective 
}
open copy[QP, Person] 
sig Person {} 
sig QP{isA:Person}

fact {
  inj[isA]
  surj[isA]
}

run {} for 4
open util/relation
sig Person {} 
sig QP{isA:Person}

fact {
  injective[isA, Person]
  surjective[isA, Person]
}

run {} for 4
open copy[QP, Person]
open util/relation

sig Person {} 
sig QP{isA:Person}

check {
  inj[isA] <=> injective[isA, Person]
  surj[isA] <=> surjective[isA, Person]
} for 4 expect 0 // no counterexample is expected to be found


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alloy relation facts

alloy relation facts


By : Artem Balan
Date : March 29 2020, 07:55 AM
Any of those help Your model allows each Line to have multiple nextLines, which might not be your intention. That's why your NoNextLineIsSelf fact doesn't actually prevent loops, because l.nextLine != l can be true if l.nextLine contains more than one Line and one of them is l. You can rewrite that fact to
code :
all l: Line | l !in l.nextLine
all disj l1, l2: Line | l2 in l1.nextLine implies l1 !in l2.nextLine
sig Message {
  formedOfLines: set Line
}
Modules Support for Alloy Titanium Projects

Modules Support for Alloy Titanium Projects


By : olko
Date : March 29 2020, 07:55 AM
To fix the issue you can do Alloy is just a different way of structuring your code, doesn't change anything for modules. You won't have a problem using them.
Alloy Facts Declaration

Alloy Facts Declaration


By : Vikki
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further I think this problem calls for the "event idiom" in Alloy. You need to model all different kinds of events that can happen (doctor performing an operation on a patient, doctor putting gloves on, doctor taking gloves off, doctor turning a glove inside out), the allowed transitions between the events, and for each transition specify all the things that get contaminated. Then you ask the Alloy Analyzer to find you a sequence of events such that in the end the doctor operated on all three patients and no one got contaminated.
It is not a trivial task, especially because you'll have to model the fact that the doctor can be wearing multiple gloves at a given time (which is required to solve this problem), but quite doable in Alloy. Here is how you might start solving it
Alloy: facts etc. about Int

Alloy: facts etc. about Int


By : Pasi
Date : March 29 2020, 07:55 AM
hope this fix your issue You can't currently say that. The only scope you can specify for integers (which tells Alloy which integers to "use") is the bitwidth (e.g., 4 Int); Alloy then always uses all integers within that bitwidth (e.g., for bitwidth of 4, integers used are -8, ..., 7).
If you have a field of type Int in your model, you can use a fact (like you said above) to restrict its values:
consistency check with contradictory facts in Alloy

consistency check with contradictory facts in Alloy


By : Zachary Nickens
Date : March 29 2020, 07:55 AM
I wish this helpful for you Take a look at the solutions to testWithoutParameters: the set A is always empty. Universally quantified formulas are always true for empty sets, so the contradictions do not matter.
testWithParameters on the other hand contains the implicit fact that there is at least one element in A: the parameter a. But there can be no a that fulfills the contradicting facts, so there is no solution for this predicate.
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