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This is a discussion group for users of the TLA+ specification language, the PlusCal algorithm language, and their associated tools.
To find out about the languages and tools, see
The TLA Home Page
Posts by non-members are moderated.
We encourage you to join the group.
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Andrew Helwer
2
May 30
Request for comment: adding EXPECT statements to model files
Thank you to all who responded with your feedback. I somewhat arduously added unit tests for the
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Request for comment: adding EXPECT statements to model files
Thank you to all who responded with your feedback. I somewhat arduously added unit tests for the
May 30
Quentin DELAMEA
, …
Shane Miller
5
May 29
Questions About TLC: Parallelism Efficiency, Caching Behavior, and Java Overloading for State-Dependent Operators
Hi Shane, Thank you for your response! If I have a correct understanding: BFS construction and
unread,
Questions About TLC: Parallelism Efficiency, Caching Behavior, and Java Overloading for State-Dependent Operators
Hi Shane, Thank you for your response! If I have a correct understanding: BFS construction and
May 29
Shane Miller
May 22
User Guide to Model Checking for Industrial Programmers with TLA+
This is a quick note that the examples in: https://github.com/gshanemiller/tla-examples together with
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User Guide to Model Checking for Industrial Programmers with TLA+
This is a quick note that the examples in: https://github.com/gshanemiller/tla-examples together with
May 22
Taylor Waggoner
, …
Markus Kuppe
9
May 18
Join us at the next TLA+ Outreach Committee meeting on December 18
The next Outreach Committee meeting [1] will take place tomorrow, May 19, at 8:00 AM Pacific Time.
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Join us at the next TLA+ Outreach Committee meeting on December 18
The next Outreach Committee meeting [1] will take place tomorrow, May 19, at 8:00 AM Pacific Time.
May 18
thomas...@gmail.com
, …
Andrew Helwer
4
May 15
TLA+ Package Manager?
There is also this somewhat classic blog post about package manager design, which is now old enough
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TLA+ Package Manager?
There is also this somewhat classic blog post about package manager design, which is now old enough
May 15
Andrew Helwer
,
Lorin Hochstein
2
May 14
A Science of Concurrent Programs is now published!
It was a while ago, but I did read through it, and I thought it was worth it. One thing I took away
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A Science of Concurrent Programs is now published!
It was a while ago, but I did read through it, and I thought it was worth it. One thing I took away
May 14
Markus Kuppe
May 12
Join Now: Monthly TLA+ Community Call
Hi all, Our monthly TLA+ Community Call is happening now. Please join us at https://zoom-lfx.platform
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Join Now: Monthly TLA+ Community Call
Hi all, Our monthly TLA+ Community Call is happening now. Please join us at https://zoom-lfx.platform
May 12
Stephan Merz
4
May 5
TLA+ Community Meeting 2026
The videos of the presentations at the meeting in Torino are now online at https://www.youtube.com/
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TLA+ Community Meeting 2026
The videos of the presentations at the meeting in Torino are now online at https://www.youtube.com/
May 5
Andrew Helwer
, …
Younes
6
May 4
Request for comment: LLM contribution policy
An interesting reference what others are discussing : https://github.com/rust-lang/leadership-council
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Request for comment: LLM contribution policy
An interesting reference what others are discussing : https://github.com/rust-lang/leadership-council
May 4
A. Jesse Jiryu Davis
, …
Markus Kuppe
11
May 2
TLC simulation mode
Unless you want TLC!RandomElement to bias successor selection with a custom (rational) distribution,
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TLC simulation mode
Unless you want TLC!RandomElement to bias successor selection with a custom (rational) distribution,
May 2
TT Three
,
Andrew Helwer
2
May 1
TLA+ Use Cases-TLA+ Mailing List
You can post these questions to this mailing list. Andrew On Fri, May 1, 2026 at 11:31 AM 'TT
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TLA+ Use Cases-TLA+ Mailing List
You can post these questions to this mailing list. Andrew On Fri, May 1, 2026 at 11:31 AM 'TT
May 1
Chris Newcombe
,
Patrick Zauner
2
Apr 30
Introductions
Links are stale (and [3] not even cited in the text), may you relink the insights? Chris Newcombe
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Introductions
Links are stale (and [3] not even cited in the text), may you relink the insights? Chris Newcombe
Apr 30
Pierre-Louis Suckrow
,
Stephan Merz
3
Apr 22
Feedback: Syncing Local and Remote ProjectFiles
Hi Stephan, Thanks again for your feedback and comments! Apologies for the delayed response. I wanted
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Feedback: Syncing Local and Remote ProjectFiles
Hi Stephan, Thanks again for your feedback and comments! Apologies for the delayed response. I wanted
Apr 22
Petru Mirzenco
, …
Younes
4
Apr 20
Specifying a multimodal AI orchestrator in TLA+ before implementation
Hi Petru, thank you for sharing, this is very interesting. I'd like to read your write-up
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Specifying a multimodal AI orchestrator in TLA+ before implementation
Hi Petru, thank you for sharing, this is very interesting. I'd like to read your write-up
Apr 20
Pierre-Louis Suckrow
, …
Andrew Helwer
6
Apr 20
State of the CLI
I'd love to, but I'm not sure how much time I can dedicate to it right now. I'm currently
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State of the CLI
I'd love to, but I'm not sure how much time I can dedicate to it right now. I'm currently
Apr 20
Georges Martin
, …
Gabriela Moreira
7
Apr 12
TLX — TLA+ specifications in Elixir syntax, with TLC integration
I have something to contribute to the implementation question. I have done some experimentation with
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TLX — TLA+ specifications in Elixir syntax, with TLC integration
I have something to contribute to the implementation question. I have done some experimentation with
Apr 12
Arian Ott
,
Andrew Helwer
4
Apr 11
Feedback wanted: Modeling Debian's New Member Process
There are no real differences between P and C PlusCal except for the start/end block syntax. I
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Feedback wanted: Modeling Debian's New Member Process
There are no real differences between P and C PlusCal except for the start/end block syntax. I
Apr 11
Pierre-Louis Suckrow
, …
fwefew 4t4tg
3
Apr 10
Guide on Spec Structuring
Mr. Suckrow, Consider reading the pdf in https://github.com/gshanemiller/tla-examples. The RPC
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Guide on Spec Structuring
Mr. Suckrow, Consider reading the pdf in https://github.com/gshanemiller/tla-examples. The RPC
Apr 10
Andrew Helwer
,
Younes
4
Apr 5
In SANY, what is the APSubstInNode AST node used for?
Ah that is a good spot, I will have to update the XML Exporter documentation. Thanks! Andrew On Mon,
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In SANY, what is the APSubstInNode AST node used for?
Ah that is a good spot, I will have to update the XML Exporter documentation. Thanks! Andrew On Mon,
Apr 5
Alberto Carretero
, …
Andrew Helwer
12
Apr 5
Model network using set or bag
I managed to find my Network module prototype. It lives in the commit at the head of this branch,
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Model network using set or bag
I managed to find my Network module prototype. It lives in the commit at the head of this branch,
Apr 5
Younes
Apr 2
Sharing a small TLA+ agent-skills repo
Hi all, I wanted to share a small repo I've been working on: https://github.com/younes-io/agent-
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Sharing a small TLA+ agent-skills repo
Hi all, I wanted to share a small repo I've been working on: https://github.com/younes-io/agent-
Apr 2
Younes
,
Stephan Merz
3
Mar 30
Stuttering: abstraction vs. implementation
That clears it up. Thank you Stephan On Sunday, March 29, 2026 at 8:54:08 AM UTC+2 Stephan Merz wrote
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Stuttering: abstraction vs. implementation
That clears it up. Thank you Stephan On Sunday, March 29, 2026 at 8:54:08 AM UTC+2 Stephan Merz wrote
Mar 30
Shane Miller
, …
Murat Demirbas
7
Mar 25
Request for review?
Andrew, Murat: Gents, thank you again for offering to review paper. Just to remind: https://github.
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Request for review?
Andrew, Murat: Gents, thank you again for offering to review paper. Just to remind: https://github.
Mar 25
Saif Mohamed
,
Andrew Helwer
6
Mar 20
Leader backs up followers quickly with persistance
https://lamport.azurewebsites.net/tla/learning.html https://learntla.com/ Andrew On Fri, Mar 20, 2026
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Leader backs up followers quickly with persistance
https://lamport.azurewebsites.net/tla/learning.html https://learntla.com/ Andrew On Fri, Mar 20, 2026
Mar 20
marta zhango
,
Andrew Helwer
2
Mar 18
Describing unless condition in lisp
Hi Marta, If you'd like, we can set up a video call to chat about your interest in TLA+ and what
unread,
Describing unless condition in lisp
Hi Marta, If you'd like, we can set up a video call to chat about your interest in TLA+ and what
Mar 18
Markus Kuppe
Mar 9
Using TLA+ to Fix a Very Difficult glibc Bug - Malte Skarupke - C++Now 2025
Using TLA+ to Fix a Very Difficult glibc Bug - Malte Skarupke - C++Now 2025 The glibc condition
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Using TLA+ to Fix a Very Difficult glibc Bug - Malte Skarupke - C++Now 2025
Using TLA+ to Fix a Very Difficult glibc Bug - Malte Skarupke - C++Now 2025 The glibc condition
Mar 9
Chris Ortiz
, …
Filip Schmole
8
Mar 4
What is the plan for Distributed PlusCal?
Hi Filip, I am very glad to hear that. I am looking forward to your email and to collaborate with you
unread,
What is the plan for Distributed PlusCal?
Hi Filip, I am very glad to hear that. I am looking forward to your email and to collaborate with you
Mar 4
Chris Ortiz
,
Markus Kuppe
4
Feb 25
How can I avoid dumping *.tlc files
Thanks Markus. I reviewed the link and that is actually a cool feature and I would like to try it out
unread,
How can I avoid dumping *.tlc files
Thanks Markus. I reviewed the link and that is actually a cool feature and I would like to try it out
Feb 25
Tim Hutt
, …
Hillel Wayne
5
Feb 25
Adding raw TLA+ to PlusCal process states
> I don't recall if you can put a `goto` inside a macro, Unfortunately you can't.
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Adding raw TLA+ to PlusCal process states
> I don't recall if you can put a `goto` inside a macro, Unfortunately you can't.
Feb 25
Mathew Kuthur James
, …
Stephan Merz
3
Feb 25
Performance when using tuples
I agree with Hillel on the answer to the first question. I also agree on his second answer. Just to
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Performance when using tuples
I agree with Hillel on the answer to the first question. I also agree on his second answer. Just to
Feb 25