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+# Big Integer Arithmetic
+
+**DRAFT STATUS** 19apr2021
+
+BigNum arithmetic is extremely common especially in cryptography,
+where for example RSA relies on arithmetic of 2048 or 4096 bits
+in length.  The primary operations are add, multiply and divide
+(and modulo) with specialisations of subtract and signed multiply.
+
+A reminder that a particular focus of SVP64 is that it is built on
+top of Scalar operations, where those scalar operations are useful in
+their own right without SVP64. Thus the operstions here are proposed
+first as Scalar Extensions to the Power ISA.