Hey, I just have a question concerning associativity :
I have :by associativity
And I needed to prove each of my steps concerning an exercise. What I found weird was in the correction part, they justify the retreat of parentheses by saying "associativty" I thought that associativity was only used when you needed to add parentheses, or it can go in both ways ? Could anyone confirm it ???
No, it is exactly the way I've put it in my first post ^^
The rule for associativity is:
Nehushtan is absolutely right; associativity applies to binary operations; that is to say, two elements combined to make one; so a four element expression doesn't exist.
I assume that the questioner intends the four element expression means 'add' elements in pairs in order going left to right hence
combine a + b, then the result with c; then that result with d. This is what Nehushtan has written.
So how do you do it?
treat (a + b) as P; c as Q; d as R
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