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  Discussion about math, puzzles, games and fun.   Useful symbols: √ ∞ ≠ ≤ ≥ ≈ ⇒ ∈ Δ θ ∴ ∑ ∫ π -

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Topic review (newest first)

anonimnystefy
2013-02-27 05:22:24

Ah, I am sorry, then.

scientia
2013-02-27 01:17:52

I think 123ronnie321 is looking for
the direct sum, not the union.

anonimnystefy
2013-02-26 17:11:54

Hi 123ronnie321

I don't think that's true. Look at A={(1,0,0),(0,1,0)} and B={(1,0,0),(0,0,1)}, for example.

, on the other hand, is true.

123ronnie321
2013-02-25 04:13:58

Let V be a vector space and A,B be subsets of V .

prove that:  span (A U B) = span (A) + span (B)

looks pretty obvious but dont know how to prove it using math

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