3 ms·
It's also an exceptionally useful technique in mathematics if you've got a few nested sums with dependend indices. By writing the condition in an Iverson bracke
by contravariant 7y ago
It's also an exceptionally useful technique in mathematics if you've got a few nested sums with dependend indices. By writing the condition in an Iverson bracket it becomes trivial to change the order of summation or change one of the variables.
- dubya 7y agoI don't know if Knuth popularized it, but it's somewhat common in combinatorics. Similar idea to using indicator functions when doing change of variables in calculus. https://arxiv.org/abs/math/9205211 https://arxiv.org/abs/math/9205211