I'm trying to install  on my MacBook. My operating system is macOS Mojave 10.14.5. When I try to install the software, I receive the following unidentified developer message:    But when I go to the System Preferences, I can't find any options to overrule it.    I was wondering why is this the case and how to fix it.
I know to secure safety it is now not allowed anymore to open apps that were not downloaded from the mac app store.  But surely there is a workaround for this to open an app that you know is 'good' but just isn't in the app store. Preferably allowing only that app and not allowing all downloaded apps to be opened.    How do I open an app that is not downloaded from the app store in mountain lion?
Claim: if $f$ is differentiable at $x = x_0$ then $f$ is continuous at $x = x_0$.   Please, see if I made some mistake in the proof below. I mention some theorems in the proof:   The condition to $f(x)$ be continuous at $x=x_0$ is $\lim\limits_{x\to x_0} f(x)=f(x_0)$.  (1) If $f(x)$ is differentiable at $x-x_0$, then $f'(x)=\lim\limits_{x\to x_0} \dfrac{f(x)-f(x_0)}{x-x_0}$ exists and the function is defined at $x=x_0$.   (2) Therefore, by the Limit Linearity Theorem, $\lim\limits_{x\to x_0} f(x)$ exists and we'll show it is equals $f(x_0)$.   (3) We'll do this by the Precise Limit Definion: given $ \epsilon&gt;0, \exists\delta|0&lt;|x-x_0|&lt;\delta$, then $0&lt;|f(x)-f(x_0)|&lt;\epsilon$. As this limit exists by (2), we can make $f(x)$ as close to  $f(x_0)$ as one wishes, therefore $\lim\limits_{x\to x_0} f(x)=f(x_0)$, what satisfies the condition for $f(x)$ be differentiable at  $x=x_0$. The end. First let me explain what I mean by "transitive" Suppose that the price of product A and the price of product B has a correlation of .5 Suppose also that the price of product B and product C has a correlation of .5  One might thing that if correlation(A,B) = .5 and correlation(B,C) = .5 then correlation(A,C) > 0, but with an intuitive example we can see why this is not the case:  Suppose that A is a fruit salad made of papaya and banana, suppose also that B is a fruit salad made of banana and strawberry and, finally, suppose that C is strawberries and cream. Clearly, when the price of banana goes up, both the price of A and B will go up; when the price of strawberry goes up the price of B and C will go up; but since A and C have no ingredients in common, their price isn't correlated.  My question is which statistical concept captures this intuitive idea. Is it the concept of dimensions?  What do I mean by transitive? Let me define the binary operator X corr? Y as 1 if correlation(X,Y) != 0 and 0 otherwise, so:   A corr? B = 1, B corr? C = 1, but  A corr? C could be = 0   If corr? was transitive, then A corr? C = 1 What defines a AAA game? I tried to find a precise definition. I found clues on  and , but I cannot find more than an approximation like:     Equivalent of blockbuster movie in cinema, an AAA game is a game with highest development budgets and levels of promotion.   The definition seems imprecise. How can I be sure a game is AAA?   Let's imagine a small indie studio making games and growing up. They hire more and more people through the years and invest more and more money in their game. At which milestone would their game be considered as AAA? The  from Goblin Punch states the following:     Hungry Coffin   HD 6 AC 14 Slam 2d6 or 2d8 Swallow 1d6 + swallow   Fly 9 Int 5 Morale 12   It says the Hungry Coffin has "HD 6". This doesn't help me at all, because I still don't know what its average HP is, or how to roll its HP. How do I figure this out? Thanks! Ubuntu 18.04 opening system settings logs me out Here is a sentence excerpted from ,     Teen suicide is a growing health concern. It is the third-leading cause of death for young people ages 15 to 24, surpassed only by homicide and accidents, according to the U.S. Center for Disease Control and Prevention.   I've heard people use both "people aged from X to Y" and "people ages from X to Y" quite often, but I've always been believing that only the former is grammatically correct, whereas in the latter the "ages" doesn't seem to serve as any grammatical component of this sentence. So when I see an APA paper use "ages" in that way, I am just quite surprised: I just can't believe such an authoritative and rigourous academic institution will let such an explicit (and indeed naive, even to a non-native speaker's eyes) grammatical mistake survive in their publications. I'm aware that in daily language usage one ought not to become so fussy over insignificant matters like this, but I do wonder whether it should be paid attention to in academic writings.  OR, using "ages" in that way is no longer considered a grammatical mistake? Honestly I don't think this'd be true, but if it really is, I'd be grateful to be informed. Thanks! Passive with "to get" In spoken English (at least in America), passives are often formed with "to get" rather than "to be;" I would wager the majority of the time:   he got hit by a car I get driven to work I've gotten called for jury duty eight times   Are there specific verbs that prefer "be" to "get," or vice-versa, or semantic differences between these forms? I cannot think of any. Remount squashfs root filessytem read-write I am working on an embedded device. The fstab shows the following info:  &lt;file system&gt; &lt;mount pt&gt;      &lt;type&gt;  &lt;options&gt;         &lt;dump&gt; &lt;pass&gt; /dev/root       /               ext2    rw,noauto                           0               1 proc            /proc           proc    defaults                            0               0 devpts          /dev/pts        devpts  defaults,gid=5,mode=620             0               0 tmpfs           /tmp            tmpfs   defaults                            0               0 ramfs           /var            ramfs   defaults                            0               0 sys             /sys            sysfs   defaults                            0               0   Running the mount command I get this:  rootfs on / type rootfs (rw) /dev/root on / type squashfs (ro,relatime) proc on /proc type proc (rw,relatime) sys on /sys type sysfs (rw,relatime) devpts on /dev/pts type devpts (rw,relatime,gid=5,mode=620) ramfs on /var type ramfs (rw,relatime)   Which means that the root filesystem is read-only.  How can I remount the read-only part as read-write? Optimal way to ignore duplicate inserts? Background  This problem relates to ignoring duplicate inserts using PostgreSQL 9.2 or greater. The reason I ask is because of this code:    -- Ignores duplicates.   INSERT INTO     db_table (tbl_column_1, tbl_column_2)   VALUES (     SELECT       unnseted_column,       param_association     FROM       unnest( param_array_ids ) AS unnested_column   );   The code is unencumbered by checks for existing values. (In this particular situation, the user does not care about errors from inserting duplicates -- the insertion should "just work".) Adding code in this situation to explicitly test for duplicates imparts complications.  Problem  In PostgreSQL, I have found a few ways to ignore duplicate inserts.  Ignore Duplicates #1  Create a transaction that catches unique constraint violations, taking no action:    BEGIN     INSERT INTO db_table (tbl_column) VALUES (v_tbl_column);   EXCEPTION WHEN unique_violation THEN     -- Ignore duplicate inserts.   END;   Ignore Duplicates #2  Create a rule to ignore duplicates on a given table:  CREATE OR REPLACE RULE db_table_ignore_duplicate_inserts AS     ON INSERT TO db_table    WHERE (EXISTS ( SELECT 1            FROM db_table           WHERE db_table.tbl_column = NEW.tbl_column)) DO INSTEAD NOTHING;   Questions  My questions are mostly academic:   What method is most efficient? What method is most maintainable, and why? What is the standard way to ignore insert duplication errors with PostgreSQL? Is there a technically more efficient way to ignore duplicate inserts; if so, what is it?   Thank you! How can I show or hide boot messages when Ubuntu starts? Is there a way to easily turn on/off showing the boot messages (loading the services) when Ubuntu starts? Is it something in Grub2?  I am running 10.04. How to output string completions to stdout? How to force Mac window to foreground? I'll be traveling to Germany this May and my planes would arrive at 4 May 20.30 at Frankfurt Airport but the Schengen visa that I received is valid only at 5 May.  Is it possible to enter if it's only a few hours before the day change? Or do I have to wait until day change in the transit area?  Another thing, would the airline rejected me from boarding the plane? Hat duplicates when info is expanded A proof using Yoneda lemma I have some kind of test data and want to create a unit test for each item. My first idea was to do it like this: import unittest  l = [[&quot;foo&quot;, &quot;a&quot;, &quot;a&quot;,], [&quot;bar&quot;, &quot;a&quot;, &quot;b&quot;], [&quot;lee&quot;, &quot;b&quot;, &quot;b&quot;]]  class TestSequence(unittest.TestCase):     def testsample(self):         for name, a,b in l:             print &quot;test&quot;, name             self.assertEqual(a,b)  if __name__ == '__main__':     unittest.main()  The downside of this is that it handles all data in one test. I would like to generate one test for each item on the fly. Any suggestions? Best place to put bug reports? What websites or other resources do users of Blender have available to them to report bugs or problems with the program?  I would like to get this issue cleared in Q&amp;A format so that we can link new users with bug-report-style questions to this post. What size images do I need for common print sizes, such as wallet size, 8x10, and 16x20?  Is there a general formula?  How could that size change if, for example, a 16x20 was printed on canvas rather than photopaper? Proof of $(A - B) - C = A - (B \cup C)$ I have several of these types of problems, and it would be great if I can get some help on one so I have a guide on how I can solve these.  I tried asking another problem, but it turned out to be a special case problem, so hopefully this one works out normally.   The question is:  Prove $(A - B) - C = A - (B \cup C)$  I know I must prove both sides are not equivalent to each other to complete this proof. Here's my shot: We start with left side.   if $x \in C$, then $x \notin A$ and $x \in B$. So $x \in (B \cup C)$ So $A - (B \cup C)$   Is this the right idea? Should I then reverse the proof to prove it the other way around, or is that unnecessary? Should it be more formal?  Thanks! Properties vs Methods Quick question: When do you decide to use properties (in C#) and when do you decide to use methods?  We are busy having this debate and have found some areas where it is debatable whether we should use a property or a method. One example is this:  public void SetLabel(string text) {     Label.Text = text; }   In the example, Label is a control on a ASPX page. Is there a principle that can govern the decision (in this case) whether to make this a method or a property.  I'll accept the answer that is most general and comprehensive, but that also touches on the example that I have given.