+ [ MEM_READ_ONLY ⇒ array_8T ? MEM_READ_ONLY MEM_READ_ONLY MEM_READ_ONLY MEM_READ_ONLY MEM_READ_ONLY MEM_READ_ONLY MEM_READ_ONLY MEM_READ_ONLY
+ | MEM_READ_WRITE ⇒ array_8T ? MEM_READ_WRITE MEM_READ_WRITE MEM_READ_WRITE MEM_READ_WRITE MEM_READ_WRITE MEM_READ_WRITE MEM_READ_WRITE MEM_READ_WRITE
+ | MEM_OUT_OF_BOUND ⇒ array_8T ? MEM_OUT_OF_BOUND MEM_OUT_OF_BOUND MEM_OUT_OF_BOUND MEM_OUT_OF_BOUND MEM_OUT_OF_BOUND MEM_OUT_OF_BOUND MEM_OUT_OF_BOUND MEM_OUT_OF_BOUND
+ ].
+
+(* (mf_mem_update mem checked addr val) = scrivi controllando il tipo di memoria *)
+definition mf_mem_update ≝
+λf:word16 → byte8.λc:Prod8T memory_type.λa:word16.λv:byte8.
+ match getn_array8T o0 ? c with