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April 20th, 2017, 11:12 PM  #1 
Newbie Joined: Apr 2017 From: london Posts: 1 Thanks: 0  Please help me write the formula
Hello, I need to formulate the follow relationship in proper math symbols: Differential in A (last day's value minus today's) has a tendency to reach the Differential in B (today's) I though this could be expressed with AΔ > BΔ But I guess there are more elegant and mathematically correct ways to do this in Maple or Mathcad? Thank you! Dave Last edited by skipjack; April 21st, 2017 at 03:35 AM. 
April 21st, 2017, 01:24 AM  #2 
Senior Member Joined: Feb 2016 From: Australia Posts: 1,533 Thanks: 513 Math Focus: Yet to find out. 
Not quite sure what you are asking. Can you give more information about A and B? Let 'last days value' = LV, and 'today's value' = TV. Then A = LV  TV, and B = TV. As you have said, you could say $\Delta A = LV  TV$. If you want to show that '$\Delta A$ approaches B', then you need to determine what causes this to happen. Or maybe, A = $V_{i  1}  V_i, \ i = 1, 2, ...$ where $i$ denotes the current day, and V is the value. 
April 21st, 2017, 03:42 AM  #3 
Global Moderator Joined: Dec 2006 Posts: 18,689 Thanks: 1522 
A definition of "tendency to reach" is needed, else any use of symbols could well be misleading.


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