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visits member for 1 year, 4 months
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Math major, lots more to learn!


7h
comment Show that every proper subgroup of this group is finite.
@Denis I see what you mean, in that case then I don't quite know where to start.
8h
asked Show that every proper subgroup of this group is finite.
Sep
17
awarded  Notable Question
Sep
2
accepted Show that the collection of all subsets of a finite sample space satisfies the 3 conditions to be called a collection of events.
Sep
2
comment Show that the collection of all subsets of a finite sample space satisfies the 3 conditions to be called a collection of events.
I think I'm confused with the difference of $S$ and the collection of all subsets of $S$. Say if $S = \{1,2\}$, then the collection of all subsets of $S$ will be $\{\emptyset\}, \{1\}, \{2\}, \{1,2\}$ right? If I let $A = \{1\}$, then what does $A^c$ look like? $A^c=\{2\}$ or $A^c=\{\emptyset\}, \{2\}, \{1,2\}$? @Dilip Sarwate as well. Thanks you guys in advance!
Sep
2
asked Show that the collection of all subsets of a finite sample space satisfies the 3 conditions to be called a collection of events.
Aug
13
accepted Given $P$ idempotent, show that $I-P$ is idempotent.
Aug
12
comment Given $P$ idempotent, show that $I-P$ is idempotent.
thanks a lot!!!!
Aug
12
comment Given $P$ idempotent, show that $I-P$ is idempotent.
thanks! after a long summer I forgot whether if matrices could be multiplied out or not...
Aug
12
asked Given $P$ idempotent, show that $I-P$ is idempotent.
Jul
2
awarded  Curious
May
13
comment Do there exist $a_k$ and $b_k$ so the equation $\sum\limits_{k=1}^{n} (a_k \sin(kx) + b_k \cos(kx)) = 0$ has no roots?
thanks @Goos and @sos440!!!
May
13
accepted Do there exist $a_k$ and $b_k$ so the equation $\sum\limits_{k=1}^{n} (a_k \sin(kx) + b_k \cos(kx)) = 0$ has no roots?
May
13
asked Do there exist $a_k$ and $b_k$ so the equation $\sum\limits_{k=1}^{n} (a_k \sin(kx) + b_k \cos(kx)) = 0$ has no roots?
May
13
asked simple extension with algebraic over the field
May
1
comment How many different proper subfields does $K$ have, where $K$ is a field of order$p^n$?
uniqueness because $d \ | \ n$?
May
1
comment How many different proper subfields does $K$ have, where $K$ is a field of order$p^n$?
@DonAntonio How will I be able to prove this property?
May
1
asked How many different proper subfields does $K$ have, where $K$ is a field of order$p^n$?
May
1
awarded  Yearling
Apr
29
accepted Is any finite-dimensional extension of a field, say $F$, algebraic and finitely generated?