## Is forex difficult? – General Forex Questions & Help

Forex is a difficult Money making business. You have to acquire specific knowledge and skills. Without skills you will lose money continuously. And for skills you have to spend time. If you think forex is easy, don’t come to here. You will lose your hard earned money. If you can give time and efforts to learn, you can give a try. Remember fir trading you need a very good broker. For this I use XeroMarkets, a fully licensed and regulated broker with customer oriented facilities.

## RAW, no.

For a caster who is required to use all components to a spell (Somatic, Verbal, or Material), there is no written mechanic to attempt to hide what is being cast.
In Xanathar’s Guide to Everything p.85, rules for identifying a spell say “If a character can perceive the casting, the spells effect, or both, the character can make an Intelligence (Arcana) check with (their) reaction or action. The DC equals 15 + the spell’s level.” This should apply as a PC watching an NPC cast a spell, or as an NPC watching a PC cast a spell.

Rules designer Jeremy Crawford states on his twitter:

In Xanathar’s, Identifying a spell requires an action or a reaction because it involves focused deduction; it’s not automatic. Moreover, I didn’t want combat to devolve into people identifying every spell.

By what he has written, a spell is already hard to identify, but a DM may homebrew this rule to instead mean a creature must spend a reaction or action to identify a spell due to all casters attempting to hide the spell being cast through some form of obfuscation, as you’ve mentioned.

## calculus and analysis – What’s the most difficult multidimensional integral that Mathematica has solved?

I am interested in benchmarking numerical integration methods and am trying to develop a wider set of difficult multivariate examples. For my particular methods, I only want to look at non-negative-valued integrands, $$f(x)geq 0$$, so that $$int f(x)dxgeq 0$$.

To be a good benchmark, the integrand would need to be (a) multivariate, with control over the number of dimensions, $$D$$, (b) have an analytic result (in any $$D$$), (c) probably not have singularities (d) be finite and non-zero and (e) be nasty: i.e. difficult for numerical integrators to handle. Note that: the integral could be either indefinite or definite; I don’t care, as long as the result is analytic.

Basically, I wanted to ask what’s the nastiest multivariate integral that you have got Mathematica to determine an analytic result for?

My current winner is the following:

$$f(x_1,x_2,…,x_D)= text{sin}(x_1+x_2)^2prod_{i=1}^{D} text{exp}(-x_i^2) text{sin}(10 x_i)^2$$

which, in two dimensions, looks like:

Plot3D(Exp(-x^2) Exp(-y^2) Sin(10 x)^2  Sin(10 y)^2 Sin(x + y)^2, {x, -2, 2}, {y, -2, 2},
PlotRange -> Full, PlotPoints -> 100)

By my definition, this is a fairly “nasty” function to integrate, likely to cause real pain to numerical methods.

In two dimensions, integrating between given bounds in two dimensions,

Integrate(Exp(-x^2) Exp(-y^2) Sin(10 x)^2  Sin(10 y)^2 Sin(x + y)^2, {x, -2, 2}, {y, -2, 2})

results in an analytic (albeit long) result:

(1/(128 E^242))(Pi) (16 E^242 Erf(2)^2 –
4 E^240 (Erf(2 + I) – I Erfi(1 + 2 I))^2 +
4 E^160 (Erf(2 + I) – I Erfi(1 + 2 I)) (Erf(2 + 9 I) –
I Erfi(9 + 2 I)) – E^80 (Erf(2 + 9 I) – I Erfi(9 + 2 I))^2 –
16 E^142 Erf(2) (Erf(2 + 10 I) – I Erfi(10 + 2 I)) +
4 E^42 (Erf(2 + 10 I) – I Erfi(10 + 2 I))^2 +
4 E^120 (Erf(2 + I) – I Erfi(1 + 2 I)) (Erf(2 + 11 I) –
I Erfi(11 + 2 I)) –
2 E^40 (Erf(2 + 9 I) – I Erfi(9 + 2 I)) (Erf(2 + 11 I) –
I Erfi(11 + 2 I)) – (Erf(2 + 11 I) – I Erfi(11 + 2 I))^2)

Because of the independent structure of the integral for dimensions 3 and above, it can easily be generalised to higher dimensions by multiplying the integral by:

Integrate(Exp(-x^2) Sin(10 x)^2 , {x, -2, 2})

which has an analytic result.

## Difficult issue with emails I send going to recipients spam after domain + hosting change

I've had a problem with emails I send for work (all to external domains) that are completely blocked or spammed, to many different recipients in various companies, since I changed my domain and hosting. I send 5-50 emails per day.

Previously it had a domain name "previous.co" with BlueHost. I changed to NameCheap 3 months ago and changed my domain name to "newdomain.io" at the same time (".com" was taken).

I have been sending emails to the same people as before, with similar messages.

Since I moved, I've had continuous issues with emails I send blocked (don't even appear in spam) or addressed to recipient spam. I have not had these problems before. They started immediately when I changed.

I have checked the shipping IP address and it is not blacklisted.

I asked recipients to whitelist my email address, with mixed results.. One company reported that they were whitelisted and that my emails to any email address for that company simply never appear. Another company was whitelisted and worked for them.

I also changed my email client in case that helped and made no difference. I was using MailSpring over IMAP, now I am using Postbox over IMAP. My sent emails appear in the sent send folder. I always send HTML and very often I have online images and attachments of all kinds.

I got a message from Microsoft stating that I was on an Outlook 365 block list, so that's a hint. I completed their form to request that the block be removed, I'm not sure if this was the case or not, but the recipient whitelisted my email and we were able to communicate for a week.

I am physically located outside of the US. USA, and almost all my recipients are in the USA. So I thought this might be a problem, but when I tracked the IP address in an email I sent, it only led to the Namecheap servers and there was no indication that I could see anywhere in my physical location .

I don't know what else to do except change my hosting from Namecheap to BlueHost; Or could the problem somehow be that my domain is too new or that it is a .io domain? Any suggestion?

Sorry for the lack of specific details, some of the tech stuff is on my mind a bit, but I'm happy to provide details if you know what to ask for.

## Why is it so difficult to create a bitcoin fork and an easy Ethereum fork?

The forks of both are equally stiff. What you are describing as "Ethereum forks" are actually smart tokens / contracts running on the Ethereum network, which is not very common in Bitcoin (but there is Omni)

EDIT: Remots Rootstock according to the clarification of the darosior. Its only relationship with Bitcoin is that it uses merged mining, just like Namecoin.

## entropy: a difficult inequality of mutual information

Leave $$X_0, X_1, X_2$$ be three bits independently distributed let's $$B$$ be a random variable such that $$I (X_0: B) = 0$$, $$I (X_1: B) = 0$$, $$I (X_2: B) = 0$$and $$I (X_1 oplus X_2: B) = 0$$, I have to show that $$I (X_0, X_1, X_2: B) leq 1$$

(where $$I (M: N)$$ is Shannon's mutual information.)

I can show that $$I (X_0, X_1, X_2: B) leq 2$$, by using the mutual information chain rule $$I (X_0, X_1, X_2: B) = I (X_0: B) + I (X_1, X_2: B | X_0) = H (X_1, X_2 | X_0) – H (X_1, X_2 | B, X_0) = 2 – H (X_1, X_2 | B, X_0) leq 2$$.

(where $$H (.)$$ is Shannon's binary entropy.)

## How can event management businesses survive these difficult times?

Hello members
I am Praveen Raj I run an event management company in Kerala. Due to Covid-19, there is no business for event planners like me … even after closing, there is no chance to see new jobs until August 2020. I have to pay rent, employee salary, bank debts etc.
Should I continue with this same business or move to another business? Any guidance appreciated

Cheers
Praveen
Co-founder
KWP Events Kochi

## Forex is a Difficult Business to Make Money – General Forex Questions and Help

Forex is a difficult business to make money. You have to acquire specific knowledge and skills. Without skills, you will lose money continuously. And for skills you have to spend time. If you think forex is easy, don't come here. You will lose the hard-earned money. If you can spend time and effort learning, you can try it. Remember that fir trading needs a very good broker. For this I use XeroMarkets, an authorized and regulated broker with customer-oriented facilities.

## implementation: how difficult and slow is it to migrate to https

I am building a MEAN stack application.
Currently, when I implement it to serve, it uses http, so the unsafe message appears along with the site name. It also creates some value flaws: How can I protect the user's password?

I am new to website development.

My question is: How difficult is it to migrate to https?

People who work safely at my institution informed me that they have already provided me with a certificate for https, but I see that it is not automatic.

I've done some research on the net, but it's still hard to get an idea if that's worth worrying about right now, it's in development mode, no one is using the site. I am using Angular, therefore http calls on all TS codes.

I am using Apache to run nodeJS in the implementation service, its service is configured to run PHP, so I had to do some proxy settings for nodeJS to run. Currently, I am doing the deployment since it was in development mode, but the site works, I just had to do some proxy settings to make the localhost port disappear and run outside of localhost.

## blockchain: how does the math problem for bitcoin mining become more difficult over time?

Bitcoin's blockchain has a property called "difficulty" or "target", which is expressed as a 32-byte number. For a new block to be valid (among many other things), the hash (another 32-byte number) must be arithmetically less than the target. This target value is adjusted after each 2016 block period by a deterministic algorithm performed by all full nodes in the network.

Imagine if I asked you to flip a coin and if you have 3 "heads" in a row, you win. How many attempts would you need to win? Once you win, I change the difficulty: now you must get 4 "heads" in a row … that will be more difficult for you and will require more "computation" (attempts).

In Bitcoin, the difficulty setting algorithm observes the block timestamp at the beginning and end of the 2,016 block period. If that time is more than two weeks, the new difficulty target becomes "easier". If the blocks are removed too quickly, the difficulty becomes "more difficult".

Further reading: Where exactly is the "off-by-one" difficulty error?