Difference between revisions of "User:Piphi/AoPS Wiki"
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| − | __NOTOC__ __NOEDITSECTION__ <div class="frontlink" style="background-color:#1b365d; color:#ffffff; font-size: 110%; padding-left:15px; padding-right:15px; padding-bottom:10px;-webkit-border-radius: 10px;"> <span style="font-size: 200%">'''Welcome to Piphi's Wiki!'''</span> | + | __NOTOC__ __NEWSECTIONLINK__ __NOEDITSECTION__ <div class="frontlink" style="background-color:#1b365d; color:#ffffff; font-size: 110%; padding-left:15px; padding-right:15px; padding-bottom:10px;-webkit-border-radius: 10px;"> <span style="font-size: 200%">'''Welcome to Piphi's Wiki!'''</span> |
The Piphi Wiki project is administered by the [[User:Piphi|<span style="color:#83a1d6;">legendary piphi</span>]] for supporting educational content useful to avid math students. | The Piphi Wiki project is administered by the [[User:Piphi|<span style="color:#83a1d6;">legendary piphi</span>]] for supporting educational content useful to avid math students. | ||
Revision as of 19:22, 12 June 2020
Welcome to Piphi's Wiki!
The Piphi Wiki project is administered by the legendary piphi for supporting educational content useful to avid math students.
and each of its non-empty subsets a unique alternating sum is defined as follows. Arrange the numbers in the subset in decreasing order and then, beginning with the largest, alternately add and subtract successive numbers. For example, the alternating sum for 
is 
and for 
it is simply 
. Find the sum of all such alternating sums for 
.
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