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17h
comment Find error in abstract algebra proof
Where is $g$ defined? Do you mean $k$?
2d
comment what are the smallest and largest values of $||v - w||$? What are the smallest and largest values of $v \cdot w$?
The absolute value means the inequality is really $-\|v\|\|w\| \leq v \cdot w \leq \|v\|\|w\|$
2d
comment Solve this puzzle?
There are many different possible functions. Are you looking for one in particular?
2d
answered what are the smallest and largest values of $||v - w||$? What are the smallest and largest values of $v \cdot w$?
Feb
7
comment How can I prove that $\frac{21n -3}{4}$ and $\frac{15n+2}{4}$ are never both integers?
I think it's a little bit nicer to look at the sum.
Feb
1
revised Chromatic Index in Graph
deleted 94 characters in body
Feb
1
answered Chromatic Index in Graph
Feb
1
answered Circles on a plane
Feb
1
comment Circles on a plane
@Shailesh Why is that the same?
Jan
31
comment Relation between areas of two regular polygons, one with twice as many sides
There's no real need to calculate the areas. The triangle ABC is half the area of a rectangle that contains the region of interest.
Jan
24
answered If $A=\sin^{20}\theta +\cos^{48}\theta $ then identify the correct option.
Dec
9
answered Prove that the triangles $ABC$ and $AB^{'}C^{'}$ have the same incentre.
Dec
5
comment Constructible decimals?
@WillJagy Sure, a different question might have a different answer. My interpretation was that the question was on 1.23456 and the poster just misunderstood what that entails.
Dec
5
comment Constructible decimals?
You can construct any rational number...
Nov
24
comment How many segments can I draw between $17$ points on the circumference of a circle so that each segment intersects all others inside the circle?
$\frac{\binom{17}{2}}{16}$ is not a whole number...
Nov
23
answered How many non-identical colorings are there?
Nov
22
comment How many non-identical colorings are there?
Do you know Polya's enumeration formula?
Nov
21
answered Show that the recursive sequence is bounded
Nov
20
answered How to prove $B$ is the least possible upper bound?
Nov
20
comment if $a ≡ b\pmod {2n}$ then prove $a^2 ≡ b^2 \pmod {4n}$
The implicit assumption when dealing with congruences implies that $k,n,b$ are integers, so $k(kn+b)$ is an integer.