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10h
reviewed Close Does there exist a bijection
11h
reviewed Leave Closed Can I use my powers for good?
11h
reviewed Reopen Identifying simple examples of fields
11h
reviewed Leave Closed Remarkable mathematics in the The Simpsons television show
11h
reviewed Reopen Rolling 1 die 5 times
15h
comment If $T$ a consistent set of sentences and $a,b$ sentences such that $T\vdash (a\rightarrow b)$and $T\vdash (\lnot a\rightarrow b)$ Then $T\vdash b$
What you write as the definition of consistent would more commonly be called "complete". Consistent just means that for some $\phi$, $T \not\vdash \phi$.
1d
revised Sum of $m\leq 300$ such that if $2013m$ divides $n^{n}-1$, then $2013m$ also divides $n-1$
edited tags; edited tags
1d
reviewed No Action Needed real valued functions with composition
1d
revised Changing order of integration for the triple integral $ \int\limits_{0}^{2} \int\limits_{0}^{2z} \int\limits_{y}^{2y} f_{(x,y,z)}\; dx\, dy\, dz $
added 299 characters in body
2d
answered Changing order of integration for the triple integral $ \int\limits_{0}^{2} \int\limits_{0}^{2z} \int\limits_{y}^{2y} f_{(x,y,z)}\; dx\, dy\, dz $
May
23
awarded  Nice Answer
May
23
answered Two dice thrown together.
May
23
comment Two dice thrown together.
This answer assumes only the top number of the die is visible. Therefore, it is wrong.
May
19
answered Logic: Can you drop parentheses in a conjunction?
May
19
reviewed Approve Logic: Can you drop parentheses in a conjunction?
May
18
comment The number of series over $\{0,1,2\}$ without repeating numbers
@columbus8myhw It seems it works, yes. The roots of the polynomial are also $2$ and $-1$, which means the recurrences have the same solution.
May
17
comment The number of series over $\{0,1,2\}$ without repeating numbers
@GeoffreyCritzer Modulo algebra computations, that's what I got as well. Cheers! :)
May
17
comment Transitive Closure and First Order Logic
$\phi$ says that one of infinitely many possibilities has to be true. Subsequently I add the negation of all these possibilities to the theory under consideration, so that it becomes inconsistent. Here, theory is used in its model-theoretic sense: just a set of formulas whose models we want to study.
May
17
revised Relation between rad(G) , Δ(G) and |G| in a graph
edited tags
May
17
answered Transitive Closure and First Order Logic