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coercion into series

• To: mathgroup at smc.vnet.net
• Subject: [mg71323] coercion into series
• From: "dimitris" <dimmechan at yahoo.com>
• Date: Wed, 15 Nov 2006 06:43:15 -0500 (EST)

In a recent post

http://groups.google.com/group/comp.soft-sys.math.mathematica/browse_thread/thread/33a3c47e98447c78/d4e48ee36db1c257?hl=en#d4e48ee36db1c257

I encountered the following commands

 Solve[(y + b) (y + c) == (a^4 + y^2 + 3) + O[y]^3, {b, c}]
 Solve[(a^2 + a c + b)(a^2 + a e + d) == (a^4 + y^2 + 3) + O[a]^5, {b,
c, d, e}]

I can't find anywhere documentation for this setting of Solve.
In what technique is based this solution?

Thanks a lot.