Christian Blatter

ETH Zurich (Switzerland)

math.ethz.ch/~blatter

Age: 80

14h
answered Find number of ways to seat $n$ boys and $n$ girls in a row so that every boy has at least one girl sitting beside him.
1d
awarded Nice Answer
1d
revised How to form a recurrence for a $n$-digit sequence using digits $0,1,2,3$ so that we have even no of $0$'s?
added 8 characters in body
1d
revised On proving that $\sin x > x \cos x$ in a right neighbourhood of zero.
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1d
answered On proving that $\sin x > x \cos x$ in a right neighbourhood of zero.
1d
revised How to form a recurrence for a $n$-digit sequence using digits $0,1,2,3$ so that we have even no of $0$'s?
added 11 characters in body
1d
answered How to form a recurrence for a $n$-digit sequence using digits $0,1,2,3$ so that we have even no of $0$'s?
1d
revised Differentiation of vector-valued function and linear transformation
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1d
answered Differentiation of vector-valued function and linear transformation
1d
answered Using ellipse for Cauchy integral.
2d
answered Am I allowed to do this chain-rule type thing when optimizing wrt to a functional?
2d
revised Exploding dice in a dice pool
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2d
revised What is the solution for this optimization problem?
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Feb
9
comment Verification of this proof that the set of real numbers is uncountable.
It is conspicuous that you have not used anything about real numbers that could not be said about the rational numbers.
Feb
9
revised Areas of triangles in hexagon
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Feb
9
answered Areas of triangles in hexagon
Feb
9
comment Union is finite implies the collection is finite
If by "collection of sets" you mean a family $(C_\iota)_{\iota\in I}$ with an index set $I$ then you could have $C_\iota=\{1\}$ for all $\iota\in I$. – Or have I missed something?
Feb
9
answered Does a definite integral define a linear functional?
Feb
9
answered What is the difference between 10% and $\frac{1}{10}$
Feb
9
answered What is the solution for this optimization problem?
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