formal is cold hard facts and perceptual is opinion.
functional is based on a focal point like Chicago for example; if you live nearby and work there, when you go out of town and someone asks where your from, you would answer "chicago".
The slums of Detroit can be considered a functional region because they share a common function or characteristic, which in this case is the presence of impoverished living conditions and lack of resources. The boundaries of this area are not formally defined but are based on the commonality of living conditions within it.
formal
if is an expression, while iff is a function often with multiple choices.
Fuctional and formal
Colloquial English is informal and conversational, often using slang and contractions, while formal English is more structured and appropriate for professional or academic settings. Colloquial English may include regional dialects and casual language, while formal English adheres to grammar rules and avoids using slang.
formal
The Grand Canyon is a Functional Region
difference between formal organization structure and informal organization structure.
explain the difference between formal and informal risk assessments
Aral sea in Kazakhstan is a formal functional region
Geographers identify three main types of regions: formal regions defined by clear boundaries and characteristics, functional regions based on a central point and the activities connected to it, and perceptual regions that are based on people's feelings and attitudes towards a particular area.
There are 3 types of regions. They are: Formal, Functional and Perceptual.