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- Thread starter KOO
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- #2

- Mar 5, 2012

- 8,999

Hi KOO!Write ⊆ or⊄in the space provided.

(3,5) _____ [3,5]

[-1,4] ____ (-1,4)

{∅} _____ P(∅)

N * Z ____ Z * N

My Solution)

⊆

⊄

⊄

⊆

The first 2 are correct.

Edit: see

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)...

- Jan 30, 2012

- 2,512

Note that P(∅) = {∅}.{∅} _____ P(∅)

- Admin
- #4

- Mar 5, 2012

- 8,999

Good point.Note that P(∅) = {∅}.

Slipped on that one.