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May
24
answered Minimum number of moves required to invert a triangular array of coins?
May
24
revised Minimum number of moves required to invert a triangular array of coins?
added 1 character in body; edited title
May
24
comment Most general linear transformation which leaves the origin fixed and preserves all distances?
The phrase "is either a rotation or a rotation followed by reflexion in the real axis" (taken from Ahlfors) is not utterly wrong, but misleading. It's like saying that a man born in New York is either born in the USA or in China.
May
24
answered three grasshoppers jumping on a plane.
May
24
answered Prove that if $A \mathbin{\triangle} C = B \mathbin{\triangle} C$, then $A = B$
May
23
awarded  taylor-expansion
May
23
comment Is there an object in reality that is proven to be uncountable?
If you believe that any infinite decimal, like $13.4802356711043\ldots$, can be the length of a stick in inches then you have to accept that there is an uncountable number of reals.
May
23
answered Probability when cutting the stick twice
May
23
comment Understanding why $a+b\sqrt {2}\neq \sqrt {3} $
There are "proofs without words", but you want a proof without thinking.
May
23
answered Two dice thrown together.
May
23
revised When is the function Continuous?
added 2 characters in body
May
23
answered When is the function Continuous?
May
23
revised How many ways to stack $n$ boxes of 4 colours so that no $2$ blue boxes are consecutive.
edited title
May
23
answered How many ways to stack $n$ boxes of 4 colours so that no $2$ blue boxes are consecutive.
May
23
comment Solve $x^2=\cos x$ using Taylor series for cosx
There cannot be more than one positive zero, even though $\cos$ is oscillating.On the other hand $x\mapsto e^{-x}$ is monotonically decreasing, and has no positive zero.
May
23
answered Solve $x^2=\cos x$ using Taylor series for cosx
May
23
revised Maximum $C$ such that every shape in $\Bbb R^2$ with area $<C$ can be placed to avoid $\Bbb Z^2$
added 81 characters in body
May
22
answered Maximum $C$ such that every shape in $\Bbb R^2$ with area $<C$ can be placed to avoid $\Bbb Z^2$
May
21
answered other form of uv notation of integration by parts
May
21
revised Line integral of a conservative field over a squre
added 162 characters in body