About Heath's theorem

What does this theorem say ?
Where is it used? In Normalization ?
soodsandeepAsked:
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Arthur_WoodConnect With a Mentor Commented:
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Vadim RappConnect With a Mentor Commented:
if there's relation between 3 entities a,b,c and you decompose it to a->b and a->c and then join them, then the result will be not less than the original relation.

> Where is it used? In Normalization ?

The above is application to relational area. The theorem itself is formulated in abstract terms, so, like every mathematical fact, it may be used wherever is applicable,
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Vadim RappCommented:
50/50 to Arthur and to me.
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Arthur_WoodCommented:
works for me.

AW
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