Talk:Test integerness: Difference between revisions
→Number set symbols not visible to most browsers
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:::: "The question is," said Alice, "whether you can make words mean so many different things." ──── ''Through the Looking-Glass'' by Lewis Carroll (Charles Lutwidge Dodgson).
::::Well,
:: Imaginary numbers are taught as existing on an orthogonal axis to the reals intersecting the reals at 0j. It ''seems'' OK to thing of am imaginary number with zero imaginary part and zero after the decimal point as equivalent to an integer for this task.
:: --[[User:Paddy3118|Paddy3118]] ([[User talk:Paddy3118|talk]]) 16:11, 25 June 2014 (UTC)
: Mathematicians define a complex number (an element of the field '''C''') as an ordered pair (''re'', ''im'') where ''re'' and ''im'' are elements of the field '''R''', the real numbers. An ordered pair of elements is quite distinct from a single element.
: If you wish to test whether a complex number is an integer you also need to be careful to state what you mean by that term. A complex integer, more usually termed a ''Gaussian integer'' or an element of the ring '''Z'''[''i''], is an ordered pair of elements (''re'', ''im'') of the ring '''Z''', the ring of integers. The sub-ring which has ''im'' = 0 is isomorphic to '''Z'''. My ''guess'' is that the latter set is what is meant when the task is extended to treat complex numbers but this should be made explicit.
: --[[User:Brnikat|Brnikat]] ([[User talk:Brnikat|talk]]) 21:15, 5 August 2015 (UTC)
==Number set symbols not visible to most browsers==
Browsers which display a graphic file (rather than locally processed MathML and local fonts) for the content of <math> tags are not displaying number set symbols on the task page, because the MediaWiki processor is choking on unexpected input and generating syntactically ill-formed HTML tags (in which a semi-colon is missing between the height and vertical-align attributes).
May be worth further investigation and testing of the expectations of the MediaWiki processor here. [[User:Hout|Hout]] ([[User talk:Hout|talk]]) 19:25, 21 September 2016 (UTC)
:No obvious permutations of '''<math>''' tag expressions achieve display of number set symbols on these MediaWiki pages in the majority of browsers at the moment (Chrome, IE/Edge, Safari, Opera etc, i.e. the browsers which display the font-independent server-side graphic) (Subject to installation of necessary fonts, it may be possible in Firefox, which uses local font-dependent processing of MathML).
:Future changes in the MediaWiki HTML generator may enable display of number set symbols in most browsers, but in the meanwhile, I suggest that we adopt the approach used in some of the discussion above, and replace the blank gaps in the task description with bold capitals like '''Z''', '''Q''', '''R''', '''C'''. [[User:Hout|Hout]] ([[User talk:Hout|talk]]) 12:52, 2 December 2016 (UTC)
:: This change has now been made (using symbol bold caps for number set symbols – this makes them visible in the majority of browsers. They were previously hidden to Chrome, IE/Edge, Safari, Opera etc)
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