Brian Vandenberg
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 Dec 3 awarded Yearling Oct 5 awarded Notable Question Aug 21 awarded Autobiographer Aug 6 comment Can you complete the expression $2 \underline{ }\, \underline{ }\, \underline{ } \,\underline{ } 5 = 2015$? I suppose you could be absurd about it and define the meaning of the symbols since those definitions are only implied, but that's probably not what they're looking for. Aug 6 comment Can you complete the expression $2 \underline{ }\, \underline{ }\, \underline{ } \,\underline{ } 5 = 2015$? It implies decimal, but it's not overtly stated. You could choose a base higher than 10 with the obvious consequence that you'd be restricted to using only the 1st 10 digits of that base. Aug 6 comment Can you complete the expression $2 \underline{ }\, \underline{ }\, \underline{ } \,\underline{ } 5 = 2015$? @achillehui Since it's labeled with number theory & recreational math I'm inclined to think it's a strictly math question. The wiggle room I was asking about is things like: is the number system base 10 (eg, your base 8 answer below)? Are we limited to elementary algebra rules for the given symbols (eg, different types of algebras)? Is selecting nothing a valid selection from the set of symbols? ... etc Aug 5 comment Can you complete the expression $2 \underline{ }\, \underline{ }\, \underline{ } \,\underline{ } 5 = 2015$? Should the question be taken at face value, or is it possible it's playing a word game? For example the words with a selection of, with a loose enough interpretation, could include the option to select nothing, eg: 20__15 Jul 15 comment What's the name of this theorem? @Ant This is true. Jul 15 comment What's the name of this theorem? The question is "what's the name of the theorem". As correct as this answer is, it doesn't give the name. Apr 16 awarded Notable Question Sep 21 awarded Famous Question Jul 18 awarded Nice Question Nov 29 awarded Popular Question Oct 17 comment Self Study in Dynamical Systems Unfortunately, the link you've provided appears to be broken. Oct 16 awarded Popular Question Jul 17 awarded Popular Question Jul 14 awarded Notable Question Feb 1 awarded Popular Question Sep 2 awarded Nice Question Mar 22 awarded Yearling