Nuprl - Proof: surjection type surjection 1 1 1 1 1 1

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At: surjection type surjection 1 1 1 1 1 1

1. A : Type
2. B : Type
3. f : A

B
4. Surj(A; B; f)
5. a :

6. s :

a

A
7. Surj(

a; A; s)
8. B Discrete
9. f o s

a

B
10. Surj(

a; B; f o s)
11. e : B

B

12.

x,y:B. (x e y)

x = y
13. b : B

i:

a. (f o s)(i) = b

By:	BackThru: Surj(a; B; f o s)

Generated subgoals:

None

About:

IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html

(11steps total) PrintForm Definitions Lemmas DiscreteMath Sections DiscrMathExt Doc