## What are the negative effects of social media?

Hello friends,

What are the negative effects of social media?

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## python – Python3 – Sum of the problems of precision between negative and positive number

I am a python class and a user asked a question that I found interesting.

It turns out that if we do the following in python

def suma(num1, num2):
return num1 + num2

print(suma(4.2, 6))


The result is 1.79999999999999999998

it's not 1.8 as it should be, so it arrives with all decimals of 4 except for 4.5

I find it very strange because with 4.5 the result is correct 5.5

## terminal – Safari 13 updates are negative for com.apple.quarantine -1, making several directories inaccessible

Updated for Safari 13 today on Mojave 10.14.6, a number of my directories ~ / Library / are now inaccessible via a terminal and other applications (even with sudo). By checking the xattr I see:

com.apple.quarantine -1


Directories concerned:

~/Library/Calendars (previously 28)
~/Library/Mail (previously 19)
~/Library/Safari (previously 15)


Two other changes in ~ / Library / that I've found are with:

com.apple.metadata:com_apple_backup_excludeItem -1


Directories concerned:

~/Library/PersonalizationPortrait (previously 61)
~/Library/Saved Application State (previously 61)


Now I can not access these directories via a terminal or other applications. Interestingly, I can browse the directory with the Finder. for example. Go to ~ / Library / Safari / Extensions / But when I click on Extensions.plist, Xcode is not allowed to open it.

I can not find documentation on the meaning of negative values ​​and how to change it, because sudo does not even have permission to change it.

Something stranger, is that my High Sierra machine does not have these com.apple.quarantine changes.

Update: It is very possible that several directories located outside of ~ / Library / are also concerned because my next Time Machine backup exceeded 1 GB and that the only thing that has changed is the installation of Safari 13.

## Forex – Trump said that US interest rates can be reduced to negative interest rates – Discussions & Help

US President Trump reintroduced yesterday (11) that the Federal Reserve should lower interest rates, even the lowest interest rates, and that the US should start refinancing debt, and that interest costs can be significantly reduced while extending the maturity. He thinks that could ease the burden of public debt.
For a long time, Trump has been bombarding the interest rate policy of Federal Reserve Chairman (Fed), Mr. Powell, but this time the rate of interest rate reduction far exceeds the point of percentage required, and even think that it can be reduced to negative rates. . However, the interest rate policy is independent and will not be affected by external speeches.
With the pullback of late July this year, the Federal Reserve (Fed) announced a one-digit rate cut (0.25%). The target range of interest rates is between 2% and 2.25%. The market is expected next week. The decision meeting on interest rates should drop more than 90% of the opportunity, by more than 90%.

Forex – Technical Analysis (Gold XAUUSD):
Today 's exchange rate – Gold (12 September) early morning at 1497.1 US dollars / ounce, according to technical analysis, the trend of the observation the level at one o'clock is sharply down after the steady decline, so that it is possible to finish the rebound after the market. .
At present, the pressure range above the short-term line is between 1504 and 1504.5 US dollars / ounce. In the downward direction, the initial support range is 1487 ~ 1487.5 US dollars / ounce. The mentality of operation is mainly short. Investors wishing to enter the market for a short period may consider the price of 1490.5 US dollars.
For the light warehouse purchase range of US $1492.5 / ounce, the MT4 operating loss point can be considered as defined below US$ 1487.5 / oz.

Forex – Technical Analysis (EUR / USD EURUSD):
Exchange rate of the day – EUR / USD (September 12) Early in the vicinity of 1.00881, after technical analysis, the trend of observation at the 1 hour yesterday (11th) level fell below the cleavage after the plunge, a deep rebound, so there is a chance At the end of the rebound, the policy of reducing interest rates has further declined.
At present, the pressure range above the short-term line is between 1.10250 and 1.10300, the downward direction, the initial support interval is 1.09700 to 1.09750 and the operational mindset is mainly short-term.
Investors who wish to enter the market in the short term may consider buying in a range of 1.1050 to 1.1080. It can be considered that the stop point of the MT4 operation is greater than 1.10250.

Forex – Technical Analysis (British Pound / USD GBPUSD):
Today's exchange rate – GBP / USD (12 September) Early in the vicinity of 1.23260, according to technical analysis, observations at the hour-long line should pay attention to the height of the head after the emergence of important head chips, to rebound after decline.
At present, the pressure range above the short-term line is 1.23850 ~ 1.23900, the direction of support downward, the initial support range is 1.22850 ~ 1 , 22900 and the operational mindset is mainly short-term. Investors who want to enter the market in the short term may consider buying between 1.23250 and 1.23300.
It can be considered that the stop point of the MT4 operation is greater than 1.23401.

Forex – Technical Analysis (NZD / USD NZDUSD):
Daily exchange rate – New Zealand dollar / US dollar (12th September) Early in the vicinity of 0.64115, cut from technical analysis, observation on line level over one hour, trend to the highest point of shock, removal of the correction to allow a breakthrough, break the upper pressure range.
Currently, the pressure range above the short-term line is 0.64400 ~ 0.64450, the direction down, the initial support interval is 0.64050 ~ 0.64100 and the mentality Operation is usually short. Investors wishing to enter the market over a short period may consider buying from 0.64340 to 0.64380. It can be considered that the stop point of the MT4 operation is less than 0.64220.

The key data of the day:
1.German monthly rate of the CPI August, final value
2.France August monthly rate of the CPI
3. Monthly rate of industrial production of the Eurozone in July
4. ECB main refinancing rate from September to 12 September
5. Number of persons claiming unemployment benefits in the United States until 7 September (10,000 persons)
6. Quarterly adjusted monthly rate of the CPI for the month of August

More Forex and MT4 information

. (tagsToTranslate) mt4 forex

## digital integration – Why would NIntegrate attribute a negative value to this strictly positive integration?

NIntegrate(
Exp(Log((a/3 - c/3) (a/3 - b/2 + c/6) (a/3 + b/2 + c/6)) +
1/2 (-((15 a^2)/4) - (15 b^2)/4 - (5 c^2)/4)) Boole(
c >= b >= 0) Boole(c >= a), {a, -Infinity, Infinity}, {b, 0,
Infinity}, {c, 0, Infinity})


The integrand is an exponential (plus some Boole terms that should not affect the sign of the integrand), that is, it is strictly positive, so why is the result negative?

What I found while searching: the result becomes positive if I delete the first term of the logarithm, $$( frac {a} {3} – frac {c} {3})$$. The restriction imposed by the second term of Boole, $$c geq to$$, force this term to be strictly negative, which can be problematic because the logarithm of a negative number is complex and the integration is done only on real numbers. However, this should not be fatal because logarithm contains three terms that are multiplied. Although this term is negative, others could also be negative to give a positive value.

This is not as if these values ​​did not exist: for example $$a = 1, b = 2, c = 3$$ satisfies both conditions of Boole, is in the integration range and gives a positive value for the logarithm:

(a/3 - c/3) (a/3 - b/2 + c/6) (a/3 + b/2 + c/6) /. {a -> 1, b -> 2,
c -> 3}


Because this point exists, it seems that the digital integral should also (and should be positive).

What's up?

## The world is about to enter a negative interest rate environment – Discussions & Help

As global economic growth gradually slows, long-term public debt floods large sums of money and negative interest rates may occur, causing gold prices to hit a record $1,920 / oz. at the end of the year (2019). If the Federal Reserve (Fed) reduced its interest rate cycle in September to keep pace with the other policies of the central bank, it should be noted that negative interest rates are a relatively harmful phenomenon for the financial system, although that they are more favorable for the borrowers, but the banking and financial systems can not function normally in a negative interest rate environment. MT4 Technical Analysis (Gold XAUUSD): Using the MT4 software to observe current gold (September 2) early in the morning, at around US$ 1526.1 / ounce, from technical analysis, the 1-hour observation trend began at enter a small range of shocks, while the yellow horizontal line ~ 0.618, so there is a chance to cross 0.618 and there will be a new uptrend. A break below 0.5 will also have a chance to pull out.
At present, the pressure range above the short-term line is between US $1534 and US$ 1534.5 per ounce, the downward direction, the initial support range is between US $1516 and US$ 1516.5. US / ounce and the operation mentality is short term. Investors wishing to enter the market in the short term may consider the price of 1527 US dollars. At the range of 1529.5 US dollars / ounce of light warehouse purchase, use MT4 software can be defined, stop loss can be considered defined above 1531.8 US dollars / ounce .

MT4 Technical Analysis (EUR / USD EURUSD):
The EUR / USD of today (September 2) Early in the vicinity of 1.09853, with the help of MT4 tool of technical analysis , the trend of observation at the level of one hour was last Friday (30), the dollar rose sharply to make inflation the euro passive The sexual weakness has disappeared, there so has a chance to see a deep rebound in the short term.
At the present time, the pressure range above the short-term line is between 1.10300 and 1.10350, in the downward direction, the initial support interval is 1.09650 at 1.09700 and the operational mindset is usually short. Investors wishing to enter the market over a short period may consider buying between 1.89800 and 1.00850. It can be set using the MT4 software and the shutdown point can be lower than 1.09700.

MT4 Technical Analysis (GBP / USD GBPUSD):
GBP / USD of today (September 2) Early in the morning, around 1.21420, according to technical analysis, the shape of the line level head of 39. one hour fell below the neck and the MT4 trend was considered a standard downtrend channel. was a chance to bounce back and fall. Trend.
At present, the pressure range above the short-term line is between 1.21750 and 1.21800, in the downward direction, the initial support range is 1.21150 to 1.21200 and the operational mindset is short term. Investors who want to enter the market in the short term may consider buying in a range from 1.21650 to 1.21690. It can be considered that the stop loss point is greater than 1.21760.

## logic – Conditional proof with negative disjunctions (bi-conditional principle)

I am a beginner in logic, so forgive me for the inevitable incompetence!

I'm trying to make a conditional proof with the sequence below, and I'd hoped to equivocate $$lnot (P lor Q)$$ with $$( lnot P land lnot Q)$$. Do I need some extra sub-proof to do that?

$$Q iff R$$ (Turnstile): $$lnot (P lor Q) implies lnot (P lor R)$$

(Impossible to find the symbol of the turnstile for MathJax, sorry).

Error in the Open Logic Project proof checker shown here.

I do not know if I can apply $$land E$$ at $$(Q iff R)$$ and extract $$(Q implies R)$$ in one operation or if it requires several steps.

Thank you for all the time taken to read my question.

## computer architecture – Why does the left arithmetic shift of the negative number lead to a positive number?

According to this Wikipedia article, when the arithmetic left shift operation is applied to a signed number, the number is multiplied by 2. However, there are certain situations where a negative number becomes a positive number when a Arithmetic left shift is applied.

Ex: Take a complement to 2, a signed integer -5 and 5 bits are used to represent it.

11011 ==> -5
10110 ==> -10 (-5x2)
01100 ==> +24 (?)


So, after two arithmetic left turns, -5 became 24. I was waiting at -20. why is this the case?

## No, you can still apply a -3 modifier

This question is understandable because the PHB armor table (p.145) indicates that you add your "max 2" dexterity modifier to your average AC armor. This is a bit ambiguous, and could be read in many ways. However, the middle armor rules spell out the modifier rules a little more explicitly than the armor table. In PHB p. 144, it is indicated (bold added):

If you wear medium armor, you add your dexterity modifier, up to a maximum of +2, the base number of your armor type to determine your armor class.

Since this clause specifies a "+" 2 as the maximum, it specifies that what we mean by "max 2" on the armor table is that a positive 2 is the upper possible modifier. Thus, the "max 2" on the armor table does not apply to modifiers lower than 0 (and thus to the "max" of +2).

Compare this with the rules of Aura of Protection, which states (PHB, p.85, added bold):

the creature gains a saving bonus equal to your Charisma modifier (with a minimum +1 bonus). You must be aware to grant this bonus.

In the absence of a statement minimum modifier, the "bonus" -3 of a dexterity of 3 or 4 could be applied to your CA if you wore medium armor.