1 files changed, 27 insertions, 0 deletions
diff --git a/net/ricketyspace/sicp/two/fourteen.scm b/net/ricketyspace/sicp/two/fourteen.scm
new file mode 100644
index 0000000..ea3e351
--- /dev/null
+++ b/net/ricketyspace/sicp/two/fourteen.scm
@@ -0,0 +1,27 @@
+;;;; Under Creative Commons Attribution-ShareAlike 4.0
+;;;; International. See
+;;;; <https://creativecommons.org/licenses/by-sa/4.0/>.
+
+(define-module (net ricketyspace sicp two fourteen)
+  #:use-module (net ricketyspace sicp two seven)
+  #:use-module (net ricketyspace sicp two ten)
+  #:use-module (net ricketyspace sicp two twelve)
+  #:export (par1 par2 R1 R2 R3 A B))
+
+(define (par1 r1 r2)
+  (div-interval (mul-interval r1 r2)
+                (add-interval r1 r2)))
+
+(define (par2 r1 r2)
+  (let ((one (make-interval 1 1)))
+    (div-interval one
+                  (add-interval (div-interval one r1)
+                                (div-interval one r2)))))
+
+(define R1 (make-interval 4 5))
+(define R2 (make-interval 7 8))
+(define R3 (make-interval 1 1))
+
+(define A (make-center-percent 6 0.5))
+(define B (make-center-percent 2 1))
+