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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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Akwasi Asante
,
Hillel Wayne
3
10:16 AM
Puzzling translation from PlusCal to TLA+
Got it. It worked. Much appreciated On Friday, March 21, 2025 at 11:37:06 AM UTC-4 Hillel Wayne wrote
unread,
Puzzling translation from PlusCal to TLA+
Got it. It worked. Much appreciated On Friday, March 21, 2025 at 11:37:06 AM UTC-4 Hillel Wayne wrote
10:16 AM
Amine BOUFTILZ
,
Stephan Merz
3
10:16 AM
The identifier is undefined or not an operator
You're absolutely right. Thank you for pointing that out! I've corrected it, and I was able
unread,
The identifier is undefined or not an operator
You're absolutely right. Thank you for pointing that out! I've corrected it, and I was able
10:16 AM
Markus Kuppe
,
Andrew Helwer
7
Mar 25
TLA+ Community Meeting 2025
The program is online at https://conf.tlapl.us/2025-etaps/. Participants will be required to register
unread,
TLA+ Community Meeting 2025
The program is online at https://conf.tlapl.us/2025-etaps/. Participants will be required to register
Mar 25
A. Jesse Jiryu Davis
Mar 25
Recent work on statistics in TLA+?
Hello! This is mainly a question for Markus Kuppe and Jack Vanlightly, but I'll ask in public for
unread,
Recent work on statistics in TLA+?
Hello! This is mainly a question for Markus Kuppe and Jack Vanlightly, but I'll ask in public for
Mar 25
jack malkovick
, …
Stephan Merz
7
Mar 19
toy strong fairness PlusCal example
Yup! Thank you! Works fine Spec == Init /\ [][Next]_vars /\ SF_vars(initial /\ pc'["Job
unread,
toy strong fairness PlusCal example
Yup! Thank you! Works fine Spec == Init /\ [][Next]_vars /\ SF_vars(initial /\ pc'["Job
Mar 19
Jinbao Chen
, …
Hillel Wayne
4
Mar 18
How to randomly select a value from a set?
Thanks for your help! That works! On Tuesday, 18 March 2025 at 03:14:57 UTC+8 Hillel Wayne wrote:
unread,
How to randomly select a value from a set?
Thanks for your help! That works! On Tuesday, 18 March 2025 at 03:14:57 UTC+8 Hillel Wayne wrote:
Mar 18
Andrew Helwer
4
Mar 17
Monthly Development Update newsletter
March TLA+ development update: a bad month for tuple-except expressions, another formal methods use
unread,
Monthly Development Update newsletter
March TLA+ development update: a bad month for tuple-except expressions, another formal methods use
Mar 17
naveen reddy
Mar 16
Need help with TLA+ specification
Hello Team, I'm trying to seek help in generating the TLA+ specification for the blockchain. I
unread,
Need help with TLA+ specification
Hello Team, I'm trying to seek help in generating the TLA+ specification for the blockchain. I
Mar 16
Markus Kuppe
Mar 12
How to (better) propose TLA+ community call agenda items
We've enabled GitHub Discussions as a place for everyone to propose agenda items in advance of
unread,
How to (better) propose TLA+ community call agenda items
We've enabled GitHub Discussions as a place for everyone to propose agenda items in advance of
Mar 12
Jaco van de Pol
Mar 4
2nd CFP CONCUR
2nd Call for Papers CONCUR 2025 https://conferences.au.dk/confest2025/concur CONCUR 2025 is the 36th
unread,
2nd CFP CONCUR
2nd Call for Papers CONCUR 2025 https://conferences.au.dk/confest2025/concur CONCUR 2025 is the 36th
Mar 4
Andrew Helwer
Mar 2
TLA+ levels of understanding
I touched on this topic in a blog post I wrote a while back called "TLA+ is more than a DSL for
unread,
TLA+ levels of understanding
I touched on this topic in a blog post I wrote a while back called "TLA+ is more than a DSL for
Mar 2
Utkarsh Sharma
,
Markus Kuppe
5
Feb 26
I get a "Cannot invoke "tlc2.debug.TLCStackFrame.getTool()" because "f" is null"
Your specification makes heavy use of recursive operators, which cause TLC to require a large stack
unread,
I get a "Cannot invoke "tlc2.debug.TLCStackFrame.getTool()" because "f" is null"
Your specification makes heavy use of recursive operators, which cause TLC to require a large stack
Feb 26
Andrew Helwer
2
Feb 19
Minimum level bound on an operator?
Okay I actually just managed to figure it out approximately one minute after sending this message.
unread,
Minimum level bound on an operator?
Okay I actually just managed to figure it out approximately one minute after sending this message.
Feb 19
Ana Ribeiro
, …
Markus Kuppe
4
Feb 19
Enhancing state transition information in TLC’s DOT output
Dear TLA+ community, I have implemented the changes to include model values in transition labels in
unread,
Enhancing state transition information in TLC’s DOT output
Dear TLA+ community, I have implemented the changes to include model values in transition labels in
Feb 19
Utkarsh Sharma
, …
Calvin Loncaric
5
Feb 18
TLA+ gives different outputs based on a printT statement or not - Booth's Algorithm
Hi, I took a close look at FixedPointMult.tla, and it looks like you have indeed discovered a bug in
unread,
TLA+ gives different outputs based on a printT statement or not - Booth's Algorithm
Hi, I took a close look at FixedPointMult.tla, and it looks like you have indeed discovered a bug in
Feb 18
Frederic Marand (FGM)
, …
Frederic Marand (FGM)
11
Feb 12
LearnTLA+ "anything can crash" not fixed by fairness
Done: https://github.com/hwayne/learntla-v2/issues/91 On Tuesday, 11 February 2025 at 17:42:10 UTC+1
unread,
LearnTLA+ "anything can crash" not fixed by fairness
Done: https://github.com/hwayne/learntla-v2/issues/91 On Tuesday, 11 February 2025 at 17:42:10 UTC+1
Feb 12
Anthony Lee
2
Feb 7
How to translate this piece of pseudocode to TLA+?
For anyone who has interest in this I added answer here: https://www.reddit.com/r/compsci/comments/
unread,
How to translate this piece of pseudocode to TLA+?
For anyone who has interest in this I added answer here: https://www.reddit.com/r/compsci/comments/
Feb 7
Mamoun FILALI-AMINE
,
Stephan Merz
2
Feb 5
definitions and theorems import in proofs
Hello Mamoun, just to clarify the context of your question: you refer to the TLA+ Proof System: TLC
unread,
definitions and theorems import in proofs
Hello Mamoun, just to clarify the context of your question: you refer to the TLA+ Proof System: TLC
Feb 5
Jonathan Ostroff
,
Frederic Marand (FGM)
2
Feb 4
Installing TLA+ Toolbox on a Silicon Mac
Just installed it yesterday. You need to have Rosetta installed - to support the current x86-64 build
unread,
Installing TLA+ Toolbox on a Silicon Mac
Just installed it yesterday. You need to have Rosetta installed - to support the current x86-64 build
Feb 4
Rob Fielding
, …
jayaprabhakar k
5
Feb 3
Markov Chains
Thanks, Hillel, for the feedback! I appreciate it. I didn't include PRISM examples directly in
unread,
Markov Chains
Thanks, Hillel, for the feedback! I appreciate it. I didn't include PRISM examples directly in
Feb 3
marta zhango
,
Stephan Merz
5
Jan 29
Defining multiple expressions and corresponding alignments
I have the commands in emacs lisp and would like to see how one might typically write them in TLA+.
unread,
Defining multiple expressions and corresponding alignments
I have the commands in emacs lisp and would like to see how one might typically write them in TLA+.
Jan 29
Markus Kuppe
Jan 29
TLA+ Community Calls Moving to Zoom
Hi everyone, we are moving the monthly TLA+ Community calls from Microsoft Teams to Zoom. You can
unread,
TLA+ Community Calls Moving to Zoom
Hi everyone, we are moving the monthly TLA+ Community calls from Microsoft Teams to Zoom. You can
Jan 29
Arseny Sher
Jan 10
-simulate mode and trace length
Hey. When running -simulate with default -depth 100 on single core mean length is 100 as expected (I
unread,
-simulate mode and trace length
Hey. When running -simulate with default -depth 100 on single core mean length is 100 as expected (I
Jan 10
William Schultz
, …
Andrew Helwer
7
Jan 2
Module instantiation semantics
One alternative way of thinking about it is that scope/contexts aren't real, only things
unread,
Module instantiation semantics
One alternative way of thinking about it is that scope/contexts aren't real, only things
Jan 2
VX2077
, …
Russell Brown
5
12/31/24
TLA+ website is down
Thank you. Do you know if there is a downloadable copy of video6v2.mp4? I couldn't find it in the
unread,
TLA+ website is down
Thank you. Do you know if there is a downloadable copy of video6v2.mp4? I couldn't find it in the
12/31/24
Karolis Petrauskas
,
Markus Kuppe
2
12/24/24
Relations
Hi Karolis, I don't know if there is an answer to your question because I wouldn't know how
unread,
Relations
Hi Karolis, I don't know if there is an answer to your question because I wouldn't know how
12/24/24
Andrew Helwer
,
Karolis Petrauskas
3
12/24/24
TLAPM now publishes rolling pre-releases
We could do that; github only allows the latest release to be a full release, not a pre-release,
unread,
TLAPM now publishes rolling pre-releases
We could do that; github only allows the latest release to be a full release, not a pre-release,
12/24/24
Jaco van de Pol
12/23/24
CONFEST2025 - Call for Workshops
CONFEST 2025 - Call for Workshops https://conferences.au.dk/confest2025 CONFEST 2025 will be held in
unread,
CONFEST2025 - Call for Workshops
CONFEST 2025 - Call for Workshops https://conferences.au.dk/confest2025 CONFEST 2025 will be held in
12/23/24
Hillel Wayne
,
Markus Kuppe
3
12/17/24
What's the difference between `-simulate` and `-generate`?
We were able to find a minimal example demonstrating the differences: ---- MODULE testgenerate ----
unread,
What's the difference between `-simulate` and `-generate`?
We were able to find a minimal example demonstrating the differences: ---- MODULE testgenerate ----
12/17/24
Andrew Helwer
,
Stephan Merz
3
12/17/24
Is there a decision procedure for telling whether a spec is machine-closed?
Hi Andrew, the problem is certainly decidable for finite-state systems. In automata-theoretic terms,
unread,
Is there a decision procedure for telling whether a spec is machine-closed?
Hi Andrew, the problem is certainly decidable for finite-state systems. In automata-theoretic terms,
12/17/24