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lynaghk's profile
Kevin Lynagh
Kevin Lynagh
Kevin Lynagh
@lynaghk

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Kevin Lynagh

@lynaghk

I design and build things. Mostly software, sometimes furniture, and a few small buildings once.

Amsterdam, The Netherlands
kevinlynagh.com
Joined January 2012

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    Kevin Lynagh‏ @lynaghk May 31

    Formal reasoning about states / behavior provides insane leverage for designing products. It shouldn't be reserved only for expert symbol manipulators. So @ryanlucas, @wootbeep, and I made an interactive playground + tutorial series: http://sketch.systems .

    5:53 AM - 31 May 2018
    • 84 Retweets
    • 228 Likes
    • sundar Yung Adult Jean-Francois Hector Jeremy Tangled Zans Terje Sten Bjerkseth Mohamad Ariau Akbar Dan Cecile emotional labor
    9 replies 84 retweets 228 likes
      1. Kevin Lynagh‏ @lynaghk May 31

        Thanks to @Hillelogram, @ztellman, @garybernhardt, @dribnet, and @colinfleming for early feedback on the tutorials and overall scope.

        0 replies 0 retweets 9 likes
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      1. New conversation
      2. Michael Nygard‏ @mtnygard May 31
        Replying to @lynaghk @ryanlucas @wootbeep

        Very cool work!

        1 reply 0 retweets 1 like
      3. Kevin Lynagh‏ @lynaghk May 31
        Replying to @mtnygard @ryanlucas @wootbeep

        Thanks! I'm just following the playbook I learned from the Clojure community: Read papers from 30 years ago and implement 'em = )

        1 reply 4 retweets 32 likes
      4. Jonathan Boston‏ @bostonou May 31
        Replying to @lynaghk @mtnygard and

        Can you share some of the papers that went into this? It looks like a great tool for thinking through application design

        1 reply 0 retweets 3 likes
      5. Kevin Lynagh‏ @lynaghk May 31
        Replying to @bostonou @mtnygard and

        Harel's original: http://www.inf.ed.ac.uk/teaching/courses/seoc/2004_2005/resources/statecharts.pdf … history: http://www.wisdom.weizmann.ac.il/~harel/papers/Statecharts.History.pdf … Horrocks UI/discussion book: https://amzn.to/2J68rFw  Samek code/embedded book:https://amzn.to/2J23Xzz 

        1 reply 0 retweets 23 likes
      6. 1 more reply
      1. New conversation
      2. ShriramKrishnamurthi‏ @ShriramKMurthi Jun 1
        Replying to @lynaghk @ryanlucas @wootbeep

        For those of us who already know a bunch about formal methods, care to compare this to other tools? To Alloy, to model checkers, to …? What's the underlying state exploration logic?

        1 reply 0 retweets 0 likes
      3. ShriramKrishnamurthi‏ @ShriramKMurthi Jun 1
        Replying to @ShriramKMurthi @lynaghk and

        I enjoyed the traffic light demo, but my "hello world" is a PAIR of [perpendicular] traffic lights, so you can also write basic safety (no two greens) and liveness (eventually each gets green) properties. I'm curious what that looks like.

        1 reply 0 retweets 1 like
      4. Hillel ∈ NYC (Oct 4-10)‏ @Hillelogram Jun 2
        Replying to @ShriramKMurthi @lynaghk and

        To my understanding this is intentionally just the specification part, not any verification part. It's to make it as easy as possible to communicate with designers and implementers about the spec.

        1 reply 0 retweets 1 like
      5. ShriramKrishnamurthi‏ @ShriramKMurthi Jun 2
        Replying to @Hillelogram @lynaghk and

        But having put all that work into developing a spec, wouldn't you want to do more with it? Put differently, there's a fine line between a "property" (to verify) and a "fact" [as Alloy calls them] (to assert). Would be nice to fluidly move between the two.

        2 replies 0 retweets 1 like
      6. Kevin Lynagh‏ @lynaghk Jun 3
        Replying to @ShriramKMurthi @Hillelogram and

        http://Sketch.systems  is trying to make the very idea of abstract states tangible and compelling to folks who've never been exposed to such thinking. It's trivial compared to Alloy, TLA+, etc. --- no state space enumeration, invariant checking, SAT solver, variable expansion.

        1 reply 0 retweets 2 likes
      7. Kevin Lynagh‏ @lynaghk Jun 3
        Replying to @lynaghk @ShriramKMurthi and

        People must experience the usefulness of counting with their fingers before they'll be motivated to learn logistic regression. http://Sketch.systems  is not for people who already love formal methods; it's for people who've never heard of them.

        1 reply 0 retweets 2 likes
      8. ShriramKrishnamurthi‏ @ShriramKMurthi Jun 3
        Replying to @lynaghk @Hillelogram and

        That seems like an unnecessarily aggressive response, and a bit of a red herring to someone who's thought about these issues a LOT, but thanks for replying and I certainly wish you well.

        1 reply 0 retweets 1 like
      9. Kevin Lynagh‏ @lynaghk Jun 3
        Replying to @ShriramKMurthi @Hillelogram and

        My apologies --- I was trying to explain our design choices, not make a value judgement or dismiss your question. Our tool doesn't model data or check invariants because *we* don't know how to implement and explain those (useful!) features without compromising accessibility.

        1 reply 0 retweets 2 likes
      10. 1 more reply
      1. New conversation
      2. Cameron Westland‏ @camwest May 31
        Replying to @lynaghk @ryanlucas @wootbeep

        What’s the best way to chat about new features? :) I’d love to be able to model concurrent states.

        1 reply 0 retweets 0 likes
      3. Kevin Lynagh‏ @lynaghk May 31
        Replying to @camwest @ryanlucas @wootbeep

        I'd love to discuss, you can email me: kevin@generalreactives.com Concurrent states are on the roadmap (it's why prototype code gets array of `active_states` rather than a single object). Not sure when, though, and how useful they'll be without, e.g., transition guards.

        1 reply 0 retweets 0 likes
      4. Cameron Westland‏ @camwest May 31
        Replying to @lynaghk @ryanlucas @wootbeep

        Yes I noticed the array. Good thinking. I’ll send you an email!

        0 replies 0 retweets 0 likes
      5. End of conversation
      1. Glen Chiacchieri‏ @Glench May 31
        Replying to @lynaghk @jonathoda and

        Glen Chiacchieri Retweeted

        Neat! I think it will be very interesting when these specs are attached more directly to code so both developers and non-developers are on the same page. E.g. understanding the slack notification algorithm from reading code is probably a nightmare: https://twitter.com/mathowie/status/837735473745289218?s=21 …

        Glen Chiacchieri added,

        This Tweet is unavailable.
        0 replies 0 retweets 3 likes
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      2. Michael Wood‏ @_wodin_ May 31
        Replying to @lynaghk @ryanlucas @wootbeep

        @DavidKPiano

        1 reply 0 retweets 1 like
      3. David K.  🎹‏ @DavidKPiano May 31
        Replying to @_wodin_ @lynaghk and

        Yep, @lynaghk showed me it a while ago! Looks really good.

        0 replies 0 retweets 1 like
      4. End of conversation

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