1 files changed, 17 insertions, 0 deletions
diff --git a/lib/dihedral.h b/lib/dihedral.h
new file mode 100644
index 0000000..813e796
--- /dev/null
+++ b/lib/dihedral.h
@@ -0,0 +1,17 @@
+
+#include <stdbool.h>
+#include <stdlib.h>
+
+#include "types.h"
+
+typedef struct {
+  q_t i;
+  bool r;
+} dihedral_t;
+
+dihedral_t *dihedral_compose(q_t q, q_t gti, const dihedral_t *g2);
+
+q_t dihedral_act(q_t q, q_t gi, q_t s);
+
+q_t dihedral_inverse_act(q_t q, const dihedral_t *g, q_t s);
+