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diff --git a/src/pkg/math/cmplx/log.go b/src/pkg/math/cmplx/log.go
deleted file mode 100644
index 881a064d8..000000000
--- a/src/pkg/math/cmplx/log.go
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-// Copyright 2010 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package cmplx
-
-import "math"
-
-// The original C code, the long comment, and the constants
-// below are from http://netlib.sandia.gov/cephes/c9x-complex/clog.c.
-// The go code is a simplified version of the original C.
-//
-// Cephes Math Library Release 2.8:  June, 2000
-// Copyright 1984, 1987, 1989, 1992, 2000 by Stephen L. Moshier
-//
-// The readme file at http://netlib.sandia.gov/cephes/ says:
-//    Some software in this archive may be from the book _Methods and
-// Programs for Mathematical Functions_ (Prentice-Hall or Simon & Schuster
-// International, 1989) or from the Cephes Mathematical Library, a
-// commercial product. In either event, it is copyrighted by the author.
-// What you see here may be used freely but it comes with no support or
-// guarantee.
-//
-//   The two known misprints in the book are repaired here in the
-// source listings for the gamma function and the incomplete beta
-// integral.
-//
-//   Stephen L. Moshier
-//   moshier@na-net.ornl.gov
-
-// Complex natural logarithm
-//
-// DESCRIPTION:
-//
-// Returns complex logarithm to the base e (2.718...) of
-// the complex argument z.
-//
-// If
-//       z = x + iy, r = sqrt( x**2 + y**2 ),
-// then
-//       w = log(r) + i arctan(y/x).
-//
-// The arctangent ranges from -PI to +PI.
-//
-// ACCURACY:
-//
-//                      Relative error:
-// arithmetic   domain     # trials      peak         rms
-//    DEC       -10,+10      7000       8.5e-17     1.9e-17
-//    IEEE      -10,+10     30000       5.0e-15     1.1e-16
-//
-// Larger relative error can be observed for z near 1 +i0.
-// In IEEE arithmetic the peak absolute error is 5.2e-16, rms
-// absolute error 1.0e-16.
-
-// Log returns the natural logarithm of x.
-func Log(x complex128) complex128 {
-	return complex(math.Log(Abs(x)), Phase(x))
-}
-
-// Log10 returns the decimal logarithm of x.
-func Log10(x complex128) complex128 {
-	return math.Log10E * Log(x)
-}