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Francis Russell [Sun, 14 Apr 2013 10:47:06 +0000 (11:47 +0100)]
Avoid introducing a sum when negating a product.
Francis Russell [Fri, 12 Apr 2013 19:35:18 +0000 (20:35 +0100)]
Minor code clean-ups.
Francis Russell [Fri, 12 Apr 2013 16:19:28 +0000 (17:19 +0100)]
Add simple example expressing a DFT.
Francis Russell [Fri, 12 Apr 2013 16:10:17 +0000 (17:10 +0100)]
Fix raising rationals to negative integers.
Haskell's Ratio implementation complains about negative exponents.
Francis Russell [Fri, 12 Apr 2013 15:59:34 +0000 (16:59 +0100)]
Make extractMultiplier handle single-term Sum.
Francis Russell [Fri, 12 Apr 2013 15:40:20 +0000 (16:40 +0100)]
Add Fractional instance for Expr.
Francis Russell [Fri, 12 Apr 2013 15:39:53 +0000 (16:39 +0100)]
Add negate implementation for Literal and Expr.
Francis Russell [Mon, 8 Apr 2013 19:40:57 +0000 (20:40 +0100)]
Initial work on symbolic representation based on Excafé.
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