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-rw-r--r--src/GRHydro_Macros.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/GRHydro_Macros.h b/src/GRHydro_Macros.h
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index 0000000..c3cdd69
--- /dev/null
+++ b/src/GRHydro_Macros.h
@@ -0,0 +1,3 @@
+#define SPATIAL_DETERMINANT(gxx,gxy,gxz,gyy,gyz,gzz) \
+ (-(gxz)**2*(gyy) + 2*(gxy)*(gxz)*(gyz) - (gxx)*(gyz)**2 - (gxy)**2*(gzz) \
+ + (gxx)*(gyy)*(gzz))