
Math General Math Forum  For general math related discussion and news 
 LinkBack  Thread Tools  Display Modes 
August 9th, 2017, 10:04 PM  #1 
Member Joined: Jul 2017 From: europe Posts: 51 Thanks: 0  Mathematical expressions...
I hope it is not too absurd. I must ask for some help... I have a very general question. What is the meaning of the following mathematical expressions? 1) q=1, M 2) i=1, N 3) m, M=0 About the first and the second expression, I have a guess... I think these expressions are just another notation for: q=1...M and i=q...N But I am not sure at all, it's just my guess.... About the third expression... I think it notates that both m and M are equal to zero. But again, I am not sure whether this is the right meaning and expression. I would highly appreciate every comment on the topic... Have a nice day! Last edited by skipjack; August 10th, 2017 at 02:12 AM. 
August 10th, 2017, 02:16 AM  #2 
Global Moderator Joined: Dec 2006 Posts: 18,595 Thanks: 1493 
(1) The notation q=1, M means that the variable q takes every integer value from 1 to M. (2) The notation i=1, N means that the variable i takes every integer from 1 to N. (3) The notation m, M=0 means that the variables (or constants) m and M are both zero, or, in certain contexts, zero initially. The above notations do not need to be in bold. I wouldn't regard q=1...M as being a standard notation, though it would normally be taken to mean q=1, M (which is more compact). 
August 10th, 2017, 09:43 AM  #3 
Member Joined: Jul 2017 From: europe Posts: 51 Thanks: 0 
I am very thankful for the explanation!! I have one more question; it is about the notation of percent. Let's consider the following two expressions: 1) b = c + %c 2) b = c + <%> Are they standard (conventional)? If the answer is YES, what exactly do they mean? I am not sure whether I am right, but this is my suggestion: 1) b is the sum of c and per cent of c (it is not indicated how many percents of c, that's why i say some percents...) 2) b is the sum of c and some per cent (it is not indicated how many percent of what...that's why i say undefined per cent of something) And what is the meaning of the special brackets <> in the second expression? I will be glad for every reply! Wish you all the best!! Last edited by DesertFox; August 10th, 2017 at 09:48 AM. 
August 10th, 2017, 10:58 AM  #4 
Global Moderator Joined: Dec 2006 Posts: 18,595 Thanks: 1493 
They both look strange to me, and I think they're not standard notation. Where did you find them? Was there any context that might indicate what they meant?

August 10th, 2017, 10:42 PM  #5  
Member Joined: Jul 2017 From: europe Posts: 51 Thanks: 0  Quote:
help me, please, what does this mean: (1;x) According to me, it looks like notation of interval. But I don't understand the use of ";" instead of "," In other word, according an interval must be written properly like this: (1,x) So, what does the expression (1;x) mean? Or again... this is not standard notation? it is confusing me And one more question. What is the meaning of ordered pair written in square brackets. For example: [x,y] Or maybe this is not a proper notation? I know what is the meaning of the square brackets in intervals. But I don't know whether square brackets have any meaning when they notate ordered pairs.... Last edited by skipjack; August 11th, 2017 at 10:26 AM.  
August 11th, 2017, 11:10 AM  #6 
Global Moderator Joined: Dec 2006 Posts: 18,595 Thanks: 1493 
I haven't come across "(1;x)" before, so I don't know what it would be used for. Similarly, I haven't come across square brackets being used for writing an ordered pair. Slightly offbeat notations may be used simply to refer to different parts of a textbook or article. They may also be features of a computer programming language. If most mathematics textbooks don't use a particular notation, it's reasonable to regard the notation as not being standard. 

Tags 
expressions, mathematical 
Thread Tools  
Display Modes  

Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Mathematical Expressions in Word  jmon117  LaTex Help  1  July 10th, 2014 10:21 AM 
Expressions  fliss1992  Algebra  4  May 7th, 2014 02:36 AM 
factorize the following expressions:  luketapis  Algebra  5  June 21st, 2012 10:07 AM 
expressions  ashimashi  Elementary Math  0  February 20th, 2010 04:44 PM 
Cauchy Expressions  grahamlee  Complex Analysis  0  March 16th, 2009 11:57 AM 