2,187 reputation
11046
bio website martin-thoma.de
location Germany
age 24
visits member for 3 years, 10 months
seen 2 days ago

I also have a blog.


2d
awarded  Constituent
Dec
19
comment Where can Gaussian Elimination be used?
I've written a detailed explanation for lights out for a German competition:bundeswettbewerb-informatik.de/uploads/media/… - page 20
Dec
8
awarded  Caucus
Nov
25
comment How to convert to conjunctive normal form?
How would you check it with Wolfram|Alpha?
Nov
13
revised sequence get number in sequence from place in sequence
formatting and language
Nov
12
comment What is the probability that either 1 or 49 is in the winning numbers of a Lotto game?
I am confused. The probability that you have both (1 and 49) would be $\frac{\binom{47}{4}}{\binom{49}{6}} = \frac{1}{66}$, the probability that you exactly one is $\frac{43}{56}$ and the probability that you have neither 1 nor 49 would be $\frac{\binom{47}{6}}{\binom{49}{6}} = \frac{13}{56}$. But those should be 1 in sum. Where is the mistake?
Nov
12
revised What is the probability that either 1 or 49 is in the winning numbers of a Lotto game?
edited title
Nov
12
asked What is the probability that either 1 or 49 is in the winning numbers of a Lotto game?
Nov
10
awarded  Benefactor
Nov
8
comment Is the power set of the natural numbers countable?
Thank you! It's so obvious when you read it ... I ask because I have an application where I need (theoretically; it is a generator) every finite subset of $\mathbb{N}$ and this is something that bothered me.
Nov
8
comment Is the power set of the natural numbers countable?
Today I thought about this again and I am a little bit confused. The powerset $\mathcal{P}(A_n)$ with $A_n := \{1, ..., n\}$ is finite for every $n$. So can't I simply count up for every $A_n$ (so first $\mathcal{P}(A_1)$, then $\mathcal{P}(A_2)$, $\mathcal{P}(A_3)$, ...? Where does it break?
Nov
8
answered Which Snake fields can be played infinitely long?
Nov
8
comment Which Snake fields can be played infinitely long?
@Jasser: n = 1, m = 5, starting point (0, 3).
Nov
8
comment Which Snake fields can be played infinitely long?
@Jasser: Not always. Think of a grid which is U-shaped and you start not at one end. Obviously it is not possible there. And I am sure there are other (non-trivial) grids where it is not possible.
Nov
8
asked Which Snake fields can be played infinitely long?
Nov
6
comment Why do we use gradient descent in the backpropagation algorithm?
You should point out that backpropagation is a (real) subset of all gradient descent algorithms. It is the subset where a training rule exists that is recursively defined (hence the name _back_propagation).
Nov
6
comment Why do we use gradient descent in the backpropagation algorithm?
Newbob training is an example of adaptive learning rates. I explain it in my bachelor's thesis (will be online in a month or so).
Nov
3
accepted How should graphs of True Positive Rate / False Positive Rate be interpreted?
Nov
3
revised How do you solve “sum of ages” puzzles?
formatting
Oct
27
accepted How do you say that variable is randomly chosen with a random distribution for range [3, 42]?