Work 9-12-22

tech/Bloom_filter.wiki

@@ -1,7 +1,7 @@
 = Bloom filter =
 
 A bloom filter is a space efficient data structure that can test if an element
-is part of a set *false positives are possible*, however false negatives are
+is part of a set. *false positives are possible*, however false negatives are
 not. Meaning it can return,
 
 * Possibly in the set

tech/Heap.wiki

@@ -0,0 +1,23 @@
+= Heap =
+
+A heap is a specialized data structure that is often represented as a tree. It
+fundamentally, however, is a set of data that satisfied the *heap property*.
+
+A heap is the most efficent implmentation of the [[priority_queue|Priority Queue]].
+
+A heap is not really a sorted structure, it is a structure that specializes in
+repeated insertion/removal with access to the largest/smalled value in said
+set.
+
+Although a heap can be implemented in many ways, they never exceed O(log n) for
+any operation, and therefore are very perfomant.
+
+== Heap Property ==
+
+The heap property states that
+
+* For a min heap
+  * Key,,child,, >= Key,,parent,,
+* For a max heap
+  * Key,,parent,, >= Key,,child,,
+

tech/algorithms.wiki

@@ -25,6 +25,8 @@ Different ways to store and operate on data, with differing efficiency
 * [[kd_tree|KD Tree]]
 * [[Heap]]
   - [[Fibonacci_heap]]
+* [[priority_queue|Priority Queue]]
+* [[merkle_tree|Merkle Tree]]
 
 == Probabilistic Data Structures ==
 
@@ -78,13 +80,13 @@ Different ways to store and operate on data, with differing efficiency
 
 === Behavioral ===
 
-* factory
+* [[factory]]
-* facade
+* [[facade]]
-* proxy
+* [[proxy]]
-* iterator
+* [[iterator]]
-* observer
+* [[observer]]
-* mediator
+* [[mediator]]
-* state
+* [[state]]
 
 == Common operations ==
 

tech/merkle_tree.wiki

@@ -0,0 +1,10 @@
+= Merkle Tree =
+
+A Merkle tree (aka hash tree) is a tree where
+
+* every leaf is labelled with the hash of a data block
+* every branch is labelled with the cryptographic hash of the labels of its
+  child nodes
+
+A hash tree is primarily used to verify the integrity of very large
+datastructures in a very efficient manner. One such common use is in Bittorrent