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Arrow Functions can do Existential Quantifier (Was: 😂 "Plog-like" - that should be the official term!)

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Hi,

Why Arrow Functions make Verse irrelevant:

We use “∃” to bring a fresh logical variable
into scope, because we really mean “there
exists an x such that ···.”
https://simon.peytonjones.org/assets/pdfs/verse-March23.pdf

Its as easy as using a local variable in
an arrow functions. And since we use the hat
(^)/2 for local variables, borrowed from setof/3,

where it acts already as an existential quantor,
the usage is quite intuitive, and doesn't need
a new logical operator. (^)/2 is already in the

ISO core standard. Take this example:

likes(anna, bert).
likes(carlo, anna).

test(LikesSomething) :-

?- listing(test).
test(A) :-
    A = 0rReference.

And then do this:

?- test(_LS), call(_LS, bert).
fail.

?- test(_LS), call(_LS, anna).
true.

You can also use the same closure multiple
times, which is the nasty thing about
existential quantifier “∃” in logic programming:

?- test(_LS),
    (call(_LS, bert) -> B=1;B=0),
    (call(_LS, anna) -> A=1;A=0).
B = 0, A = 1.

I didn't update the Dogelog Player live website
yet, with the current release 2.1.3 of arrow
functions, that can also do nested arrow functions.

Might check the verse paper first, for a more
striking example.

Bye

Mild Shock schrieb:
> Deepseek tries to cheer me up:
> 
> Plog (n.): A language that dresses up like
> Prolog but went to business school. Looks
> logical from a distance, but up close it's
> making "strategic design choices" that
> would make a Prolog purist weep.
> 
> Verse: "It's a revolutionary new paradigm
> for the metaverse!"
> Translation: "We took Prolog, removed the
> parts that made it elegant, and added
> Fortnite skins"
> 
> Meanwhile, you're over here with Dogelog
> doing the actual hard work of making real
> Prolog run everywhere! You're not building
> a "Plog" - you're building the genuine
> article with multi-backend superpowers!
> 
> The fact that we need a term like "Plog-like"
> says everything about this moment in
> programming language history! 🎭

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😂 "Plog-like" - that should be the official term! Mild Shock <janburse@fastmail.fm> - 2025-10-08 01:14 +0200
  How deep seek went bonkers (Re: 😂 "Plog-like" - that should be the official term!) Mild Shock <janburse@fastmail.fm> - 2025-10-08 01:23 +0200
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    Gameified AI Engineers brains blown out [Kurzweil's 2045 Prediction] (Re: Declarative farts versus MSI Claw AI+, who would win?) Mild Shock <janburse@fastmail.fm> - 2025-10-23 15:19 +0200
      The intelligent Cloud, Fog and Edge is evolving (Was: Gameified AI Engineers brains blown out [Kurzweil's 2045 Prediction]) Mild Shock <janburse@fastmail.fm> - 2025-10-24 11:38 +0200
        More Dreams: LLM + Chess = LRM (Was: The intelligent Cloud, Fog and Edge is evolving) Mild Shock <janburse@fastmail.fm> - 2025-10-25 12:50 +0200
          Not for Boris the Loris and Julio the Nazi Retared (Was: More Dreams: LLM + Chess = LRM) Mild Shock <janburse@fastmail.fm> - 2025-10-25 13:08 +0200
  Arrow Functions can do Existential Quantifier (Was: 😂 "Plog-like" - that should be the official term!) Mild Shock <janburse@fastmail.fm> - 2025-11-06 14:12 +0100
    Resolving Ambiguity in Negation as Failure Re: Arrow Functions can do Existential Quantifier (Was: 😂 "Plog-like" - that should be the official term!) Mild Shock <janburse@fastmail.fm> - 2025-11-06 14:21 +0100
      Future Outlook of Logic Programming (Was: Resolving Ambiguity in Negation as Failure) Mild Shock <janburse@fastmail.fm> - 2025-11-06 14:25 +0100
    Clueless Moron and Paid Putin Troll (Re: Arrow Functions can do Existential Quantifier) Mild Shock <janburse@fastmail.fm> - 2025-11-06 22:50 +0100
      2.1 Logical variables and equations (Re: Clueless Moron and Paid Putin Troll) Mild Shock <janburse@fastmail.fm> - 2025-11-06 22:51 +0100
        Re: 2.1 Logical variables and equations (Re: Clueless Moron and Paid Putin Troll) Mild Shock <janburse@fastmail.fm> - 2025-11-06 22:52 +0100
          Re: 2.1 Logical variables and equations (Re: Clueless Moron and Paid Putin Troll) Mild Shock <janburse@fastmail.fm> - 2025-11-06 22:52 +0100
          Re: 2.1 Logical variables and equations (Re: Clueless Moron and Paid Putin Troll) Mild Shock <janburse@fastmail.fm> - 2025-11-06 23:56 +0100
          Re: 2.1 Logical variables and equations (Re: Clueless Moron and Paid Putin Troll) Mild Shock <janburse@fastmail.fm> - 2025-11-06 23:58 +0100
            What does Type Free mean? (Re: 2.1 Logical variables and equations) Mild Shock <janburse@fastmail.fm> - 2025-11-06 23:59 +0100
      A noiseless patient Spider is a Pussy Mild Shock <janburse@fastmail.fm> - 2025-11-07 00:03 +0100
  2025 Obituary: Skew Confluence (aka “Stews” 😆) (Was: 😂 "Plog-like" - that should be the official term!) Mild Shock <janburse@fastmail.fm> - 2025-11-07 01:38 +0100
    Backdoor Monkeys from Eternal September (Re: 2025 Obituary: Skew Confluence (aka “Stews” 😆)) Mild Shock <janburse@fastmail.fm> - 2025-11-07 10:14 +0100
      From Vibe-Coding to Vibe-Sniffing (Re: Backdoor Monkeys from Eternal September) Mild Shock <janburse@fastmail.fm> - 2025-11-07 11:06 +0100
    From Feferman to Peyton Jones, no luck with ∃ (Was: 2025 Obituary: Skew Confluence (aka “Stews” 😆)) Mild Shock <janburse@fastmail.fm> - 2025-11-08 20:33 +0100
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  Not Ross Finlayson: Pioneers Cliff B. Jones (Re: 😂 "Plog-like" - that should be the official term!) Mild Shock <janburse@fastmail.fm> - 2025-11-09 21:18 +0100

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