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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
Aug
29
accepted Recommendation for a book and other material on dynamical systems
Aug
11
comment Recommendation for a book and other material on dynamical systems
I just ran across this course, for others who are interested: youtube.com/watch?v=mkfU9zVNGkQ&feature=relmfu