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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: 1,322 Thanks: 453 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: 17,919 Thanks: 1386 A definition of "tendency to reach" is needed, else any use of symbols could well be misleading.

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