[DL] tableau or tableauX ?

Ulrike Sattler sattler at cs.man.ac.uk
Fri Apr 20 13:09:52 CEST 2007

On 18 Apr 2007, at 09:14, Son LeThanh wrote:

> Hi all,
> Maybe my question is considered silly, but I hope that DL community  
> can explain me what is the difference between the word "tableau"  
> and "tableauX" and how to use them.

Hi Son,

your question is not silly at all - and I admit that we haven't  
always been consistent in the usage of these 2 terms. In general,  
since "tableau" is french, "tableaux" is plural, and they are both  
pronounced in exactly the same way, i.e., the "x" is silent. Now we  
could think of a tableaux algorithm/expansion rules/etc. as an  
algorithm/rules/etc. that uses/expands one or several tableau"s". Or  
we could think of tableau algorithm/expansion rules/etc. as an  
algorithm/rules/etc. that is based on the notion of a tableau...

Recently, I tried to be a bit more consistent in the usage of this  
"x", but I think there are no general rules to it (apart from the  

This problem is also considered elsewhere: for example, on the  
discussion page of http://en.wikipedia.org/wiki/ 
Method_of_analytic_tableaux you find:
"The method is usually called (Semantic or Analytic) Tableaux (from  
French?) as the Title also indicates. In the body of the page though  
it is called Tableau. Should that be updated? DRap 09:09, 9 January  
2007 (UTC)

Yes, the word originally entered English via French. "Tableaux" is  
plural (in both English and French, "Tableaus" is an alternative  
English plural, but rarely used, and, to my knowledge, never in this  
context), "Tableau" is singular. To add to the confusion, to my  
German ear, they both sound exactly the same ;-). --Stephan Schulz  
09:20, 9 January 2007 (UTC)
Yes, perhaps we could clarify? You will often see in the article 'a  
tableau' and this should be made distinct from 'the tableaux' (is the  
'x' silent?). I have seen it reffered to both as semantic tableaux  
and tableau, but don't which would be more appropriate here 04:32, 16 January 2007 (UTC) Kris Micinski  "

Cheers, Uli

> For example, in the paper "A Tableaux Decision Procedure for SHOIQ"  
> of Horrock et al., there are phrases:
> - "a tableauX decision procedure"
> - "design of tableauX algorithms"
> - "the SHIQ tableauX algorithm"
> - "The SHOIQ tableau algorithm"
> - "a tableauX algorithm for SHOIQ"
> - "A tableau algorithm for SHOIQ"
> - "the tableau algorithm"
> - "The tableauX expansion rules for SHIQ"
> - "Tableau systems for SHIO and SHIQ."
> If there is no difference between these words, I think there should  
> be a consistency in using words.
> Thank you very much for your help.
> Best regards,
> Son
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Ulrike Sattler
sattler at cs.man.ac.uk

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