X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~mdw/git/catacomb/blobdiff_plain/a6b6ae6baba64bf876bac6e4d34b364035666183..bebee98a111a5bee06db1393679dfd625ebe9ee3:/math/mp-fibonacci.c?ds=inline

diff --git a/math/mp-fibonacci.c b/math/mp-fibonacci.c
index 9b37ebff..1db9b21a 100644
--- a/math/mp-fibonacci.c
+++ b/math/mp-fibonacci.c
@@ -37,7 +37,7 @@
  * %$F_{k-1} = F_{k+1} - F_k$%; in particular, %$F_{-1} = 1$% and
  * %$F_{-2} = -1$%.)  We say that %$F_k$% is the %$k$%th Fibonacci number.
  *
- * We work in the ring %$\ZZ[t]/(t^2 - t -1)$%.  Every residue class in this
+ * We work in the ring %$\ZZ[t]/(t^2 - t - 1)$%.  Every residue class in this
  * ring contains a unique representative with degree at most 1.  I claim that
  * %$t^k = F_k t + F_{k-1}$% for all %$k$%.  Certainly %$t = F_1 t + F_0$%.
  * Note that %$t (F_{-1} t + F_{-2}) = t (t - 1) = t^2 - t = 1$%, so the