Can anyone identify this mathematical symbol for me?

Question

I'm studying logic in my Mathematical Economics module..

I keep seeing a symbol which is almost like a 'C', but the edges aren't as curved and it's flat along the top and bottom. It's almost like a 'u' turned so that the edges point to the right. Sorry this description is at best vague, but it won't let me paste it in and I can't find it anywhere anyway!

I would be so grateful if you could tell me what it means in the context of logic and notation and sets!

Thank you

Answer 1

You used to be able to do it using the Alt key and a combination of numbers on the numeric keypad and you needed a copy of the ascii character codes, but most laptops do not have the numeric keypads anymore. The easiest way to access those characters is to run the "character map" program. You can find that by clicking on the Start Menu/All Programs/Accessories/System Tools/character map. When the program loads and you don't see the characters that you want you may just need to change the font by clicking the scroll arrow and selecting the proper font. Some of these signs may be in the font that you are currently using but the most common special character fonts are; "Symbol", "Wingdings", "Wingdings 2", and "Wingdings 3" for example.

Answer 2

A ⊂ B is reading Set A is included in set B

Answer 3

If you mean what I think you mean, it means "is a subset of".



So

A *that symbol* B means "A is a subset of B", or "everything in A is also in B".