My Math Forum  

Go Back   My Math Forum > Math Forums > Math

Math General Math Forum - For general math related discussion and news


Thanks Tree3Thanks
  • 1 Post By skipjack
  • 1 Post By skipjack
  • 1 Post By skipjack
Reply
 
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.
DesertFox is offline  
 
August 10th, 2017, 02:16 AM   #2
Global Moderator
 
Joined: Dec 2006

Posts: 18,245
Thanks: 1439

(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).
Thanks from DesertFox
skipjack is online now  
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.
DesertFox is offline  
August 10th, 2017, 10:58 AM   #4
Global Moderator
 
Joined: Dec 2006

Posts: 18,245
Thanks: 1439

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?
Thanks from DesertFox
skipjack is online now  
August 10th, 2017, 10:42 PM   #5
Member
 
Joined: Jul 2017
From: europe

Posts: 51
Thanks: 0

Quote:
Originally Posted by skipjack View Post
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?
The source (the original text) is not reliable... it is not from a textbook.

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.
DesertFox is offline  
August 11th, 2017, 11:10 AM   #6
Global Moderator
 
Joined: Dec 2006

Posts: 18,245
Thanks: 1439

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 off-beat 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.
Thanks from DesertFox
skipjack is online now  
Reply

  My Math Forum > Math Forums > Math

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





Copyright © 2017 My Math Forum. All rights reserved.