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The symbol I'm looking for can have several names, I want to use for "contraction" (of a measure and a set).

It should look like the lower left half of \square, that is, like \llcorner but bigger. I've found different packages containing the symbol, but none of them seems to be compatible with amssymb.

Does anybody know where to find such a symbol? Thanks

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up vote 7 down vote accepted

You can use Detexify to recognize symbols name, and then just google for it.

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That tool is awesome, I was about to suggest the same +1 – brandstaetter Nov 17 '09 at 12:15
+1 Awesome tool :-). – sleske Nov 17 '09 at 12:16
Great tool! Unfortunately, it does not find the symbol. – Martijn Nov 17 '09 at 14:12

I would begin with the Comprehensive LaTex Symbols list from CTAN. Are you looking for something like \niv ? (check out page 60 of the symbols-letter.pdf.) It's in the Natural mATHematics notation package form CTAN.

More on \niv from the nath guide, pg 9:

Nath introduces \vin and \niv as names of the im- portant symbols ‘_ |’ and ‘| _ ’ not included in any standard math font.

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I have the Comprehensive list on my desk :); unfortunately is not very searchable. \niv seems to be what I'm looking for, but including the nath package results in loads of errors: "Leaders not followed by proper glue". I'll see if I can fix this. – Martijn Nov 18 '09 at 7:18
Turns out that nath is not compatible with AMS document classes, or at least clashes with the use of AMS multiline equation environments – Martijn Nov 18 '09 at 7:36
Take a look at the nathguide: On page 16, it specifically talks about using \usepackage{amssymb,nath} . There is also a quote math mode commands must be those of Nath - (if using amsmath). This implies you may have to use the nath versions of some constructs when using this package. It also says "A number of math commands have been redefined; \old{command} often provides access to what \command was before Nath redefined it". Significantly, the math environment is disabled in nath, which might be a problem. – DaveParillo Nov 18 '09 at 15:32
Nath uses two distinct math modes. The single dollar sign $ invokes the in-line mode. The double dollar sign $$ as well as other math environments invoke the display mode. – DaveParillo Nov 18 '09 at 15:36

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