Terminology – What is the equivalent of the integer symbol Z for n integers only for bits?

For bound sets, it is common to use interval notation.

specifically, $[a,b]$ means "real numbers between $ a $ and $ b $inclusive "while $[amathinner{ldotp ldotp}b]$ means "integers between $ a $ and $ b $, including ". If you put one of the square brackets in a curve, it means that the endpoint is not included: $ a not in (a, b]$, for example.

In this case, you want the interval $[0mathinner{ldotpldotp}2^n)$[0mathinner{ldotpldotp}2^n)$[0mathinner{ldotpldotp}2^n)$[0mathinner{ldotpldotp}2^n)$, If you think the separators do not match and look funny, you can use them $[0mathinner{ldotp ldotp}2^n-1]$,

P.S. LaTeX has no built-in "two points", so I used that mathinner { ldotp ldotp} from this answer.

Formatting – setting a double breakpoint on a symbol

I wanted to do Mathematica notation with a colon over a symbol. No results were found during the online search or in the documentation. However, it is only accidentally attempted to give the parameter a second parameter OverDot Function surprisingly exactly what I needed:

Enter the image description here

I assume the red text indicates that Mathematica perceives this as a syntax error at a certain level, although the output is as desired. Unfortunately, that does not work for three or more points.

Is there an appropriate way to do this without red text appearing?

Navigation – what's right? Whether the symbol should be used after the label or the symbol in front of the label?

There are several scenarios to classify the solution. That seems good for what you did in this case


To the Previous it would be better to go opposite,

For some familiar symbols, labels are placed below it:

Google products

The best is, however progressive reduction, Do not use a label.

Users are familiar with the symbol. They see it all the time and therefore the meaning is forever anchored in their memory. Yes, the data shows that labels enhance the user experience for the majority of users by using the character, However, what the data can not take into account is the expertise of a single user.

The concept is simple enough. When a user becomes familiar with a user interface, they need less signage. In the same way as when you first visit a department store in a major street, we may need to consult the floor plan, but over time and after repeated visits, the need for orientation is less and less required. We quickly learn that the men's ties are in the back of the upper floor or the women's shoes on the ground floor.

When applied to a digital product, the progressive reduction can help remove labels that are no longer needed if the user knows what the button does. This makes the design cleaner and allows the user to focus on other tasks that are relevant to their expertise.

Now we have to stick to the starting point of this design approach and apply it to the way users align and consume content. The first step is to understand the importance and strength of the system character we create

What does the crossing symbol (∩) mean when applied to two unspecified elements?

I came across a piece of literature in which I saw the crossing symbol (∩) on two unset elements in the definition of an equivalence relationship; I posted it below for reference. The items in question are supposed to represent different files on a computer. What could this intersection symbol mean in this context?

Definition of an equivalence relationship

$ 25 Fast and easy symbol contest

I have to create 5 icons. These icons must be in PNG or GIF format, depending on whether there are animations for the specific On (s).

For these symbols you can use existing elements (fontawesome, whatever). I'm looking for them in a circle, with a background color, an icon in the middle and maybe a border (if it looks good). If you think it looks better without a border, you can enter different variations.

Examples of good circular symbols can be found at: http://iconion.com/

These 5 icons are displayed in a tree diagram / chart and are intended to represent the following (see font for examples of truck / factory icons I had imagined):

  • Unknown person (possibly "question mark" or "anonymous" with a gray background?)
  • Dealer (maybe "truck" icon with orange / brown background?)
  • Supplier (possibly "factory" icon with violet background?)
  • Selected (Not sure? "Star" icon or something? Blue background?)
  • Client (possibly "person" icon with green background?)

I thought about possibly having a pulsating glowing ring around the "client" icon. Something like this, but no rings that go out, only the glow that increases and decreases around the outside of the symbol to make it more visible than the others. This is the icon that would require the GIF format. Another example that I like is this (but I do not need to turn the circle …).

You may see hundreds of these icons in the graph / chart at the same time. Try to keep it simple and clean.

The winner will be announced within the next 4 hours. The winner will receive $ 25 via PayPal.

If you have questions, feel free to ask.

How to calculate the entropy of a symbol and the entropy rate?

I have been writing this question for some time now in my textbook:

A box contains 4 cubes:

  • 2 fair 4-sided dice A and B: p (i) = 1/4 i = {1, 2, 3, 4}
  • 1 loaded 4-sided cubes C: p (2) = 1
  • 1 loaded 4-sided dice D: p (3) = 1

You randomly pick one of the dice and throw it indefinitely. The Wurffolge can as output of the source S = S1, S2 ,. , ,

Calculate the entropy of a symbol H (S) and the entropy rate H * (S):

I know that the entropy of a symbol can be determined using the following equation:

  • H (S) = lim, since n goes to infinity H (Sn)

and the entropy rate:

  • H * (S) = lim, if n is infinite (H, S1, S2, …, Sn) / n

But I am still not sure how to proceed, although I have already calculated the probability P (S1, …, Sn).

c ++ symbol not found when implementing the stack

I implement a stack with nodes. I'm working on the knot class. My professor asks me to write a base node class that uses a blank pointer, and a child class myNode that's used as a template (I know it's extra work, but he wanted us to learn the concepts of the empty pointer and stack ).

Here's the code (I'll abbreviate it because I just have a similar problem in my code)


Class node {
Node (void * ptr);
void setDataPtr (void * ptr);

void * dataPtr;
Node * next;


#include "node.h"

node :: node ()
dataPtr = next = nullptr;

node :: node (void * ptr)
dataPtr = ptr;
next = nullptr;

void node :: setDataPtr (void * ptr) {
dataPtr = ptr;


#include "node.h"
Class myNode: public node
myNode (const T & data = T ());


myNode:: myNode (const T & data)
node :: setDataPtr (new T (data));


#include "mynode.h"
int main ()
myNode j (& # 39; 1);

The problem I encounter is isis

Undefined icons for the x86_64 architecture:
"node :: setDataPtr (void *)", referenced by:
myNode:: myNode (char const &) in main.cpp.o
"node :: node ()", referenced by:
myNode:: myNode (char const &) in main.cpp.o
ld: Icon (s) for architecture x86_64 not found
clang: error: linker command failed with exit code 1 (use -v to display the call)

I do not understand this mistake at all. I would be glad if someone could help me with what it is. Many thanks!