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Jan
28
comment Why isn't a set like $\{0,1,3,6,8\}$ a subgroup of $\mathbb{Z}_9$?
What operation are you expecting to do here? If addition then where would 1+1 go as 2 isn't in the set? You need to remember that the subgroup has to be closed under that operation.
Jan
28
comment Probability with $2$ colored balls and one box: $1/3$ or $1/4$?
In that case, are you sure all 3 cases have exactly the same probability of happening?
Jan
28
revised Probability with $2$ colored balls and one box: $1/3$ or $1/4$?
edited for fraction.
Jan
28
comment Proving that if $a|b$ and $b|a$, then $a = \pm b$ for $a,b$ as nonzero integers?
How well do you know the definition of what a divides b means? Usually this is expressed as a zero remainder and some other integer existing so that $b=k*a$ which may help here.
Jan
28
revised Probability with $2$ colored balls and one box: $1/3$ or $1/4$?
added 480 characters in body
Jan
28
answered Probability with $2$ colored balls and one box: $1/3$ or $1/4$?
Jan
28
comment Probability with $2$ colored balls and one box: $1/3$ or $1/4$?
How are you eliminating a black white case from existing?
Jan
28
comment Show that $504 \mid n^9 − n^3 $ for any integer $n$
Could you factor $n^9-n^3$ as a way to show that 7,8, and 9 are factors?
Jan
27
revised How to compute (10mod42)(17mod42)^-1
rearranged symbols
Jan
27
answered How to compute (10mod42)(17mod42)^-1
Jan
26
answered Path needed for solving these linear equations in Zn (my example Z105)
Jan
22
comment Is there a metric space where 2 + 2 = 5?
Integers mod 1 would have 2+2=5 as it would be the same as 0+0=0 where 0 is the only number in the system, Quite boring in some ways yet would be a solution here.
Jan
22
comment Trigonometric identity via complex exponential
math.stackexchange.com/help/notation would be one link under that "help" option in the top row that may be useful. math.stackexchange.com/help is a link to the general help stuff. Posting the "enter image description here" for your images is a bit sloppy you do realize right?
Jan
22
comment Trigonometric identity via complex exponential
Why can't you enter the questions in MathJax like most others would?
Jan
20
comment How many five-digit numbers can be formed using digits 3,0,6,6,6?
3% of 700 is 21, so I'm not sure how you're expecting to get a 5 digit number to have only 3% be 21.
Jan
19
comment With 8 bits is it possible to obtain an integer in more than one way?
From en.wikipedia.org/wiki/Signed_number_representations : "Like sign-and-magnitude representation, ones' complement has two representations of 0: 00000000 (+0) and 11111111 (−0)."
Jan
19
comment With 8 bits is it possible to obtain an integer in more than one way?
What about the case of signed integers?
Jan
18
revised Name of this specific type of function
added recurrence relation point and a couple of examples
Jan
18
answered Name of this specific type of function
Jan
15
answered Understanding what a plane is in $\mathbb R^3$