It refers to the theory that a second author wrote part of Isaiah, and that it wasn't Isaiah himself. So, it actually has to do with source criticism (and hence redaction criticism), not so much textual criticism.

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Rev. Lane Keister
Teaching Elder, PCA, North Dakota (working out of bounds in a CRC and an RCA church)
http://greenbaggins.wordpress.com
http://brahmsgreenglove.blogspot.com
http://accenttranslation.blogspot.com
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