I know how to spell "occurrence" correctly but I wouldn't hesitate for one second to reply to a node with "occurrance" in the title.
I don't really think that's the point. I think the point is that, if I'm looking for information about 'occurances of numbers', I will find nodes with the misspelling and participate in them. Whereas, if I look for 'occurrances of numbers' I will find nodes with the correct spelling and participate in them instead. It's all about people who are interested in the same information being able to find each other.
By ensuring the correct spelling in the node title, you can bring the two groups together. A simple Search for 'occurrance' would find all the nodes about occurrances of numbers, and a Super Search for 'occurance' would still find those with the misspelling preserved in the body. Everyone wins.
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In reply to Re^3: Consider this: What makes a good node title?