Not a Superset Of

The Mathematical Symbol "Not a Superset Of (⊅)"

The "Not a Superset Of" Symbol (⊅)

In set theory, the symbol ⊅ represents the relationship between two sets, where one set is not a superset of another. This means that the first set does not contain every element of the second set.

Understanding ⊅

Set A is a superset of set B if every element of B is also an element of A. If this isn't the case, we say that A is not a superset of B and represent this relationship with the ⊅ symbol.

Example 1: Simple Sets

If Set A = {1, 2, 3} and Set B = {1, 2, 4}, then we can say: \[ A ⊅ B \] Because the number 4 is present in Set B but not in Set A.

Example 2: Subsets and Supersets

If Set X = {a, b, c} and Set Y = {a, b, c, d}, then: \[ X ⊅ Y \] Even though X is a subset of Y, X is not a superset of Y because it does not contain the element 'd'.

Applications of ⊅

The ⊅ symbol is utilized in various areas such as:

• Mathematics: Particularly in set theory, where relationships between sets are fundamental.
• Computer Science: In the study of data structures like sets and databases, where understanding relationships between datasets is critical.

In summary, the ⊅ symbol is vital for expressing the relationship where one set is not a superset of another. Recognizing this relationship is key to understanding the deeper structures and hierarchies in sets.

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Codes for the ⊅ Symbol

The Symbol	⊅	copy
Alt Code	Alt 8837	copy
HTML Code	⊅	copy
HTML Entity	⊅	copy
CSS Code	\2285	copy
Hex Code	⊅	copy
Unicode	U+2285	copy

How To Insert the ⊅ Symbol

(Method 1) Copy and paste the symbol.

The easiest way to get the ⊅ symbol is to copy and paste it into your document.

Bear in mind that this is a UTF-8 encoded character. It must be encoded as UTF-8 at all stages (copying, replacing, editing, pasting), otherwise it will render as random characters or the dreaded �.

(Method 2) Use the "Alt Code."

If you have a keyboard with a numeric pad, you can use this method. Simply hold down the Alt key and type 8837. When you lift the Alt key, the symbol appears. ("Num Lock" must be on.)

(Method 3) Use the HTML Decimal Code (for webpages).

HTML Text	Output
<b>My symbol: &#8837;</b>	My symbol: ⊅

(Method 4) Use the HTML Entity Code (for webpages).

HTML Text	Output
<b>My symbol: &nsup;</b>	My symbol: ⊅

(Method 5) Use the CSS Code (for webpages).

CSS and HTML Text	Output
<style> span:after { content: "\2285";} </style> <span>My symbol:</span>	My symbol: ⊅

(Method 6) Use the HTML Hex Code (for webpages and HTML canvas).

HTML Text	Output
<b>My symbol: &#x2285;</b>	My symbol: ⊅

On the assumption that you already have your canvas and the context set up, use the Hex code in the format 0x2285 to place the ⊅ symbol on your canvas. For example:

JavaScript Text
const x = "0x"+"E9" ctx.fillText(String.fromCodePoint(x), 5, 5);
Output
⊅

(Method 7) Use the Unicode (for various, e.g. Microsoft Office, JavaScript, Perl).

The Unicode for ⊅ is U+2285. The important part is the hexadecimal number after the U+, which is used in various formats. For example, in Microsoft Office applications (e.g. Word, PowerPoint), do the following:

Type	Output
2285 [Hold down Alt] [Press x]	⊅ (The 2285 turns into ⊅. Note that you can omit any leading zeros.)

In JavaScript, the syntax is \uXXXX. So, our example would be \u2285. (Note that the format is 4 hexadecimal characters.)

JavaScript Text	Output
let str = "\u2285" document.write("My symbol: " + str)	My symbol: ⊅

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