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1h
comment A game with checkers
I corrected after the comment
2h
revised A game with checkers
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revised A game with checkers
added 77 characters in body
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revised A game with checkers
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answered A game with checkers
2d
comment (In)Completeness: First Order x Second Order
you should maybe precise that you are talking about proof systems, not to be confused with for instance incompleteness of first-order Peano arithmetic.
Jul
19
comment Showing that $A\rightarrowtail A \times \{x\}$ is a bijection
you probably mean $A\times\{x\}$
Jul
18
comment Some examples of applications of Game Theory
not specifically, try to explore...
Jul
18
comment Interview riddle
yes it is 6, I just increased the size.
Jul
18
revised Interview riddle
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Jul
18
comment Some examples of applications of Game Theory
if you are looking for open problems from game theory, then there are a lot. Some are accessible at highschool levels, as many games have not been studied extensively, so a project could be to take a game that is not too well-known (you can even invent one), and study it from a game-theoretic point of view, then present your result at the science fair.
Jul
18
comment Proof needed for this exercise from “Linear Algebra Done Right”
taking basis is always a good start with finite-dimensional vector spaces
Jul
18
comment Why is this definition of complex numbers “informal”?
@DavidK Then what you are doing is putting new constant and axioms in mathematics, so you don't work in ZFC anymore (or the system you worked with), but in "ZFC+some axioms about i", which is formal but not really what we want to do.
Jul
18
revised Some examples of applications of Game Theory
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18
revised Why is this definition of complex numbers “informal”?
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Jul
18
comment Why is this definition of complex numbers “informal”?
Because you introduce a "mysterious number" $i$ with some properties, without really defining what it is by means of previously defined objects.
Jul
18
answered Why is this definition of complex numbers “informal”?
Jul
18
answered Some examples of applications of Game Theory
Jul
16
comment Two elementary question on automaton and language
The "monoid-recognizable" are all languages if you don't restrict to finite monoids, since every language is recognized by $A^*$.
Jul
16
comment Regular Pentagon is the Unique Largest Two-Distance Set in the Plane
Why are there only 4 intersections ? You don't look at intersection of $C(A,d_1)$ with $C(B,d_2)$ for instance ?