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What is the difference between the combination of split inside equation* and align*?

A   &= B+C\\
    &= X+Y

A   &= B+C\\
    &= X+Y
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As it is here not much. Split can handle just one alignment column, whereas align can handle many more.

This is of course a difference if one remove the stars

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another difference -- align can accommodate more than one split; equation can handle just one. this becomes more interesting if you want the split things numbered, just one number per split as opposed to a number on every line with align. – barbara beeton Mar 4 '11 at 13:34

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