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## Re: [uom-ontology-std] What is mass?

 To: Pat Hayes uom-ontology-std Joe Collins Wed, 30 Sep 2009 12:02:41 -0400 <4AC38121.8020709@xxxxxxxxxxxx>
 Pat Hayes wrote: > > On Sep 29, 2009, at 10:30 PM, Joe Collins wrote: > >> Pat, >> >> > Well, actually, it is. It means 'the same as'. It does not mean 'nearly >> > the same as' or 'not the same as, but so close that I can't measure the >> > difference' or 'very likely very close to' or any of these other >> > notions. Equal means *equal*. If A=B then there is *one thing* with two >> > names, not two things that are very close. >> >> You are correct in that approximately equal, not being transitive, can >> not be an equivalence relation. >> >> In that case, I must conclude that >> >> > 1 m = 1.00 m : true or false? >> >> is false > > ?? I am gobsmacked, both by the conclusion and by the logic. Why is 1 > only approximately equal to 1.00 ? The bare numeral '1' refers to the > number one. The decimal numeral '1.00' refers to the sum of the number > one, zero tenths and zero hundreths. I believe if you do the addition, > that also comes to one. >    (01) To quote again from the SI standard, ISO/DIS 80000-1, "Quantities and units" ----snip---- 7.3.3 Error and uncertainty When a number is given without any further information it is generally interpreted so that the last digit is rounded with a rounding interval equal to 1 in the last digit (see Annex B). Thus, for example, the number 401 008 is generally assumed to represent a value between the two values 401 008,0 ± 0,5, i.e. between 401 007,5 and 401 008,5. ----snip----    (02) Not a hallucination, just reading the standard I thought we were trying to capture (which, being educated as a physicist, I already knew before reading the standard).    (03) Regards, jbc    (04) -- _______________________________ Joseph B. Collins, Ph.D. Code 5583, Adv. Info. Tech. Naval Research Laboratory Washington, DC 20375 (202) 404-7041 (202) 767-1122 (fax) B34, R221C _______________________________    (05) _________________________________________________________________ Message Archives: http://ontolog.cim3.net/forum/uom-ontology-std/ Subscribe: mailto:uom-ontology-std-join@xxxxxxxxxxxxxxxx Config/Unsubscribe: http://ontolog.cim3.net/mailman/listinfo/uom-ontology-std/ Shared Files: http://ontolog.cim3.net/file/work/UoM/ Wiki: http://ontolog.cim3.net/cgi-bin/wiki.pl?UoM_Ontology_Standard    (06)
 Current Thread Re: [uom-ontology-std] What is mass?, (continued) Re: [uom-ontology-std] What is mass?, Chris Partridge Re: [uom-ontology-std] What is mass?, Gunther Schadow Re: [uom-ontology-std] What is mass?, Pat Hayes Re: [uom-ontology-std] What is mass?, Pat Hayes Re: [uom-ontology-std] What is mass?, Pat Hayes Re: [uom-ontology-std] What is mass?, Joe Collins Re: [uom-ontology-std] What is mass?, Pat Hayes Re: [uom-ontology-std] What is mass?, Joe Collins Re: [uom-ontology-std] What is mass?, Duane Nickull Re: [uom-ontology-std] What is mass?, Pat Hayes Re: [uom-ontology-std] What is mass?, Joe Collins <= Re: [uom-ontology-std] What is mass?, Duane Nickull Re: [uom-ontology-std] What is mass?, Pat Hayes Re: [uom-ontology-std] What is mass?, Pat Hayes Re: [uom-ontology-std] What is mass?, Pat Hayes Re: [uom-ontology-std] What is mass?, Gunther Schadow Re: [uom-ontology-std] What is mass?, Pat Hayes Re: [uom-ontology-std] What is mass?, Pat Hayes Re: [uom-ontology-std] What is mass?, Matthew West