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*From*: Lee <fowler.lee8@xxxxxxxxx>*Date*: Fri, 26 Apr 2024 04:17:46 -0700 (PDT)*References*: <07aaecb6-6368-4ffb-b7ca-5579d656a625n@googlegroups.com> <882fb42f-40d7-4ad4-980e-a23a55261fddn@googlegroups.com> <28c9fe31-7a26-428f-af36-4d30c2a618aen@googlegroups.com> <F38F1FE8-B042-445F-875E-99033895FDF2@lemmster.de> <f2c82e65-92e1-4c06-b61a-dfd78d19a017n@googlegroups.com> <716A2450-2F69-4E48-98ED-699794A62A69@gmail.com> <B9A5CC33-3D90-4BDD-9D26-7A489F3AFD88@gmail.com> <a6bc077f-a4d6-40f5-8a58-ca11b669f351n@googlegroups.com>

Hi Marta,

If you want to know more about Cardinality please see this page by Hillel Wayne (https://learntla.com/core/operators.html?highlight=cardinality) . Since you said you're new, I can also recommend reading his entire tutorial page and blog posts in addition to his book (https://www.amazon.se/-/en/Hillel-Wayne/dp/1484238281). Other resources when you're done working these are:

- Specifying Systems by Leslie Lamport (which is only TLA+)

- http://lamport.azurewebsites.net/tla/learning.html - great way to get into how to think about this

Regards

Lee

On Friday, April 26, 2024 at 10:11:55 AM UTC+2 marta zhango wrote:

That is what I needed to see as I am new to all this, with no idea where to start.On Friday, April 26, 2024 at 4:39:07 PM UTC+12 Stephan Merz wrote:P.S.: Proofs of these theorems checked by TLAPS are given in https://github.com/tlaplus/tlapm/blob/main/library/FiniteSetTheorems_proofs.tla.On 26 Apr 2024, at 06:37, Stephan Merz <Stepha...@xxxxxxxxx> wrote:As Markus pointed out, cardinality of finite sets is defined in a standard module of TLA+. A collection of lemmas about finite sets and cardinality, useful for actually reasoning about these notions, is available at https://github.com/tlaplus/tlapm/blob/main/library/FiniteSetTheorems.tla (included in the distribution of TLAPS).StephanOn 26 Apr 2024, at 02:22, marta zhango <marta...@xxxxxxxxx> wrote:Is the lineIN CS[S]part of the definition of cardinality ?On Friday, April 26, 2024 at 11:55:57 AM UTC+12 Markus Kuppe wrote:https://github.com/tlaplus/tlaplus/blob/03c7bf4f35ccf1217ac2c53e5bf60d1220c8b0d8/tlatools/org.lamport.tlatools/src/tla2sany/StandardModules/FiniteSets.tla#L21-L27

> On Apr 25, 2024, at 4:53 PM, marta zhango <marta...@xxxxxxxxx> wrote:

>

> Have thought something like this too

>

> Cardinality(set) == (+ e \in DOMAIN set: IF set[e] THEN 1 ELSE 0)

>

> On Friday, April 26, 2024 at 9:17:00 AM UTC+12 marta zhango wrote:

> Like this for instance ?

>

> Cardinality (S) = |S| == Count ( e \in S )

>

>

> On Friday, April 26, 2024 at 8:36:13 AM UTC+12 marta zhango wrote:

> How can I define the cardinality of a set as the number of elements in a set S

> using the notation |S| using TLA.

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**Follow-Ups**:**Re: [tlaplus] Defining Cardinality with TLA***From:*marta zhango

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**Re: [tlaplus] Defining Cardinality with TLA***From:*Stephan Merz

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