The Mathematical Symbol "Left Tack (⊣)"

The "Left Tack" Symbol (⊣): A Unique Bond in Logic and Mathematics

Within the intricate tapestry of mathematical symbols, the ⊣ symbol, commonly referred to as the "Left Tack," has a distinctive niche. It emerges mainly in logic, set theory, and other domains of mathematics, symbolizing a relationship that's not as commonly discussed as, say, equality or summation but holds its own importance. Let's delve deeper into the world of the Left Tack.

Deciphering the ⊣ Symbol

The ⊣ symbol is often used to depict a unique relationship between two statements or elements. While its exact interpretation can vary based on context, it is frequently associated with the concept of "reverse entailment" or "is a function of" in logic and set theory.

Example 1: Reverse Entailment in Logic

If \( P \) and \( Q \) are two logical propositions, \( P ⊣ Q \) might imply that \( Q \) logically entails \( P \), or in other words, if \( Q \) is true, then \( P \) must also be true.

Example 2: Function Relationship

In some contexts, especially in category theory, the symbol ⊣ is used to denote a specific kind of morphism relationship, reflecting a special type of mapping between structures.

Applications and Contexts

The Left Tack's utilization stretches across multiple mathematical branches:

  • Logic: Representing relationships between propositions where one entails the other.
  • Set Theory: Denoting specific kinds of mappings or functions between sets.
  • Category Theory: Indicating a unique morphism relationship, often in the context of adjoint functors.

The ⊣ symbol might appear esoteric to those unfamiliar with advanced logic or theoretical mathematics. However, its consistent usage across these domains underlines its significance in capturing relationships that other symbols can't adequately represent.

In summary, the ⊣ symbol is a testament to the depth and breadth of mathematical notation. While it may not be as ubiquitous as some other symbols, its presence ensures that specific, nuanced relationships have a clear and concise representation in the language of mathematics.

Mathematical symbol 'Left Tack'

Are You Good at Mathematical Symbols?

Do you know, or can you guess, the technical symbols? Well, let's see!
gold cup

gold cup

gold cup

  • This test has questions.
  • A correct answer is worth 5 points.
  • You can get up to 5 bonus points for a speedy answer.
  • Some questions demand more than one answer. You must get every part right.
  • Beware! Wrong answers score 0 points.
  • 🏆 If you beat one of the top 3 scores, you will be invited to apply for the Hall of Fame.
Scoring System

Guru (+)
Hero (+)
Captain (+)
Sergeant (+)
Recruit (+)

Codes for the ⊣ Symbol

The Symbol
Alt CodeAlt 8867
HTML Code⊣
HTML Entity⊣
CSS Code\22A3
Hex Code⊣

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 8867. When you lift the Alt key, the symbol appears. ("Num Lock" must be on.)

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

HTML TextOutput
<b>My symbol: &#8867;</b>My symbol: ⊣

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

HTML TextOutput
<b>My symbol: &dashv;</b>My symbol: ⊣

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

CSS and HTML TextOutput
span:after {
content: "\22A3";}
<span>My symbol:</span>
My symbol: ⊣

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

HTML TextOutput
<b>My symbol: &#x22A3;</b>My symbol: ⊣
On the assumption that you already have your canvas and the context set up, use the Hex code in the format 0x22A3 to place the ⊣ symbol on your canvas. For example:
JavaScript Text
const x = "0x"+"E9"
ctx.fillText(String.fromCodePoint(x), 5, 5);

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

The Unicode for ⊣ is U+22A3. 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:
[Hold down Alt]
[Press x]

(The 22A3 turns into ⊣. Note that you can omit any leading zeros.)
In JavaScript, the syntax is \uXXXX. So, our example would be \u22A3. (Note that the format is 4 hexadecimal characters.)
JavaScript TextOutput
let str = "\u22A3"
document.write("My symbol: " + str)
My symbol: ⊣