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diff --git a/70/CH3/EX3.1.3/3_1_3.sci b/70/CH3/EX3.1.3/3_1_3.sci
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+//page 145
+clear;
+close;
+clc;
+A=[1 3;2 6;3 9];
+disp(A,'A=');
+ns=kernel(A);
+disp(ns,'Null space=');
+disp(A(1,:)*ns,'A(1,:)*ns=');
+disp(A(2,:)*ns,'A(2,:)*ns=');
+disp(A(3,:)*ns,'A(3,:)*ns=');
+disp('This shows that the null space of A is orthogonal to the row space.');
+//end