Los Alemanes crearon un nuevo tipo de minas diferente a las minas habituales de contacto : las minas magnéticas. Un arma secreta desconocida por la royal navy y que la dejó en un principio totalmente desprevenida.
Buscando en Google, he visto este thread de un foro sobre la segunda guerra mundial en el que se habla de este tipo de mina y de la forma de dragarlas que encontraron los aliados :
http://www.forosegundaguerra.com/viewtopic.php?t=13402#p181610

Creo que se trata de Adam Smith, economista y filósofo Escocés del siglo XVIII, considerado por muchos como el padre de la economía moderna y fundador intelectual del sistema económico dominante es decir el liberalismo éconómico o capitalismo.
Adjunto el link de su biografía en Wikipedia : https://es.wikipedia.org/wiki/Adam_Smith.

Right now, it gives me more confidence to keep safe my money in the bank because the banking system is regulated and you have many more guarantees against fraudulent operations. I would like it to be different in the future and really the crypto world becomes a reliable alternative to banks but I think that there is still a long way to go before it is possible.

I find it difficult that this year Ripple can overcome its ATH and reach to $ 5 because it would mean a market increase for XRP from 20 Billion to 200 Billion, which seems unlikely at the moment with a bear market since the beginning of the year. The market is unpredictable and we don't know what direction it will take at the end of the year but it's difficult to imagine that in just over 3 months such a large increase for Ripple and for the other cryptocurrencies. If it exceeds $1, I would be satisfied.

Personally, I also think it is very difficult to know what will happen at the end of this year and if we will have a new bull run like the last year because almost the whole year has been quite regular with a generalized bearish trend since January and that is not an invitation to optimism. It seems unlikely that suddenly and in so few months, the situation will change completely.

I have invested last year in Ripple and although I have had to wait a long time to see its price rise, I don't regret it. In the middle of bull run at the end of the year, I got to multiply my investment for more than x10 but I did not sell anything and now I'm only slightly above the price that I bought. I will continue holding the coin until I can get close to his ATH and can sell part, at least to recover my initial investment. I still think that Ripple has been a good investment for me and only my own decisions have stopped me from making benefit. It may not happen this year but I think the coin still has potential and will again overcome the price of $ 3.

On the bear market, I'm being conservative and I only hold, hoping that the cryptocurrencies in which I have invested approach their ATHs and I can sell part or all to make an interesting profit. Like many, I think it is a very bad time to sell and I would rather recommend buying at such low prices to comfort positions and hold in the medium / long term because sooner or later the market will recover completely and it will be the best time to sell. In my portfolio, I also have a bit of BTC, ETH and XRP.

I think it will depend on the person, his personal situation and where you live. If you spend a lot of time a day and get enough income to live exclusively from that, it can be considered a job but if you do it sporadically and only get an additional income or none, it could be said a hobby. In any case, it would be like having an unstable job without guarantee of obtaining enough income to live and it can not be compared with the stability of receiving a salary every month and having a legal protection from a conventional job.

I also think that giving the identity and attaching a service invoice with our name and address would have to be sufficient if we only exchanged cryptocurrencies. If the exchange proposes to change with Fiat money in that case for those who want it, it is essential to have to verify your bank account if you intend to pass funds from fiat to crypto or from crypto to fiat. In any case it has to be an option and not an obligation according to my point of view because if you intend to pass to fiat, you will have to provide your bank details anyway.

The current situation of ETH does not invite optimism, like the other cryptocurrencies, its price has been reduced considerably since January and nobody could predict that we would be in September in this situation after what happened last year but we must continue to rely on its recovery and again exceeds $ 1000 even if it is within 2 or 3 years because as you indicate we are talking about altcoin number 1 that has the support of many investors and I do not think it can disappear.

The market is unpredictable and I think anything could happen. However, months go by and apart from some punctual rebound, there are no obvious signs of improvement that suggest that the month of October is the beginning in a new bull market. We would all like to see what happened last year but it seems quite difficult for it to happen again after the experience so far in 2018 and we will probably have to wait a little longer to notice significant improvement and be able to approach the values of the end of 2017.

Se trata de una  indeterminación de tipo (infinito/infinitivo)
Para aclarar la indeterminación, dividimos el numerador y el denominador por la variable que tiende más rápidamente a infinito. En este caso, entre todas las potencias de X que aparecen la mayor es X^3
Dividiendo numerador y denominador por X^3, se obtiene :

lim x->inf. ((2X^3/X^3)+(6X^2/X^3))/((3X^3/X^3)+(9/X^3))
lim x->inf. (2 + (6/X))/(3 + 9/X^3)
= (2 + 0)/( 3+ 0)
= 2/3

Teniendo en cuenta que n/infinito = 0 y simplificando  la función.

No entendía muy bien 6X*2 si te referías a la multiplicación de 6X por 2 (12X) o 6X elevado al cuadrado, de todas formas el resultado es cero porque la división de un número por el infinito tiende a 0 y en este caso no cambia nada en el resultado final.

Reaching its ATH at the end of 2018 seems difficult considering the general market situation since the beginning of the year, but nothing is impossible in the world of cryptocurrencies and less for ETH.
Last year for the same dates it was just under $ 300 and managed to climb almost up to $ 1400 in January. Ethereum is a strong coin and despite the bleeding caused in part by the ICOs, I still trust it and I think it will recover in 2019.

I am also very confused with the market movements of these last days and in these conditions I prefer to hold my coins that I bought at a higher price. Now I am trying to comfort some positions and I am also looking to buy some coins that I have always liked but that seemed too expensive to be able to buy a reasonable amount that allows me to obtain some interesting benefit when the market recovers. The option that I completely discard is the sale of my coins.

I would like the events to be repeated at the end of 2017, but realistically, I do not think it will happen again, seeing the current situation and everything that has happened throughout the year and I just hope that a slight recovery is achieved for December 2018, bringing Bitcoin closer to 10K and boosting the growth of the other cryptocurrencies. In these difficult times, we must be patient and continue to rely on market recovery that may take longer than we would like.

I think it is very difficult to know what will happen between October and November in the market of cryptocurrencies and a hypothetical bull run for the end of 2018, but to date the year has been quite bad with a market capitalization reduced to more than half since January and it seems unlikely that in 2 or 3 months we see a totally different trend. However, I remain optimistic for the future, even if it is not so short-term.

Sometimes I regret not having sold a little at least to recover the investment and leave the rest in hold. Right now, I have to be patient but I am convinced that BTC will reach its ATH again and will surpass it in the future. It may not be this year because from the beginning we are in a bear market  and there are not many signs of recovery but perhaps after the decision of the SEC postponed to September 30 on the Bitcoin ETFs we can start to see some light at the end of the tunnel.

For my part, I think that there is still trust in ETH because it is a very strong project and it remains the second cryptocurrency behind Bitcoin in terms of capitalization and will surely remain the first in terms of transactions made.
It is likely to be difficult to see ETH again at almost $1500 (ATH) at least in the short term but I think nothing is impossible and I think it would not be the best choice to sell at that low price.

El cáculo es de doble factorial n!! que es igual al producto de n por todos los naturales que le preceden que tienen la misma paridad que el propio n
Si n es par entonces se multiplican los pares hasta el 2
Si n es impar entonces se multiplican todos los impares hasta el 1

El cáculo sería :

10!! / 8!! = (10 x 8 x 6 x 4 x 2)/(8 x 6 x 4 x 2)= 3840 / 384 = 10

It is difficult to answer your question because the market is bearish since 8 months and any beginner who would like to invest in cryptocurrencies, would be scared to see so much volatility in the market. Even so the best and most conservative would be to bet on the top 10 coins for example because they are projects that have proven their strength and it is more reliable to invest in recognized projects than to bet on new projects right now. The important thing is to do your own research and to foresee that if you buy right now, you should consider holding for a more longer time to expect benefits.