This is good cop / bad cop applied to argumentation.
There is another, quite common and devious, way to split Motte and Bailey. The Motte is the definition actually used operationally, while the Bailey is the cover story used when this is questioned.
Aristotle called this the fallacy of equivocation. If we remembered everything we already knew, we would be unstoppable as a civilization. Koestler pointed out (in Sleepwalkers) that in 1000 AD (now called CE) we knew less math than we knew 1200 years earlier.
This is good cop / bad cop applied to argumentation.
There is another, quite common and devious, way to split Motte and Bailey. The Motte is the definition actually used operationally, while the Bailey is the cover story used when this is questioned.
Aristotle called this the fallacy of equivocation. If we remembered everything we already knew, we would be unstoppable as a civilization. Koestler pointed out (in Sleepwalkers) that in 1000 AD (now called CE) we knew less math than we knew 1200 years earlier.