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KOO

New member
Oct 19, 2013
19
Write ⊆ or in the space provided.

(3,5) _____ [3,5]
[-1,4] ____ (-1,4)
{∅} _____ P(∅)
N * Z ____ Z * N


My Solution)




 

Klaas van Aarsen

MHB Seeker
Staff member
Mar 5, 2012
8,780
Write ⊆ or in the space provided.

(3,5) _____ [3,5]
[-1,4] ____ (-1,4)
{∅} _____ P(∅)
N * Z ____ Z * N


My Solution)




Hi KOO! :)

The first 2 are correct.

Edit: see Evgeny.Makarov's post for the 3rd.

As for the 4th, can I assume you intended $\mathbb N \times \mathbb Z \underline{\qquad} \mathbb Z \times \mathbb N$?
If so then the left hand side has elements like (1,1) and (1,-1), while the right hand side has elements like (-1,1) and (1,1)...
 

Evgeny.Makarov

Well-known member
MHB Math Scholar
Jan 30, 2012
2,492
I assume the first two questions are about intervals on the real line. Then I agree.

{∅} _____ P(∅)
Note that P(∅) = {∅}.
 

Klaas van Aarsen

MHB Seeker
Staff member
Mar 5, 2012
8,780