My point wasn't that I know it. More that I knew it once, but probably could not have recalled it accurately for most of of my career and never missed the absence of the recall. I've never had the need to establish the formal, algorithmic complexity of any given algorithm in the real-world, since I learnt the formal methods involved. But the informal appreciation of what the notation means has allowed me to discuss algorithms without worrying too much about the fine distinctions.
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.