What ⩁ means
It means bag subtraction in Z notation. A bag, or multiset, records how many copies of each item it contains. Subtract matching counts from one bag by the counts in the other; a count cannot go below zero.
Z is a formal notation for describing computer systems; its mathematical conventions were proposed around 1981.
Use ⩁ only when the notation defines its bag meaning. For ordinary sets, follow the document's set-difference notation.
Part of collections
Don't confuse it with
1
Questions people ask
1Is ⩁ ordinary set subtraction?
No. In Z's bag operation, repeated-item counts are subtracted; use your document's notation for ordinary set difference.
More like this
9
How to type or find ⩁
- Also called
- Z notation bag subtraction
- Search it as
- bag subtraction · bag difference · Z notation · multiset subtraction · bag minus · set difference
- Shows up in
- Anything that takes text · its shape is whatever your font draws
Windows (Word)
Windows
HTML
⩁CSS
\2A41Codes and encoding1 code points
HTML decimal
⩁
HTML hex
⩁
CSS content
content: "\2A41";
Each escape is closed by the next backslash; a trailing space is needed before a literal hex digit.
URL encoded
%E2%A9%81
1
On screen
1
Code points
1
JS .length
3
UTF-8 bytes
A visible symbol can contain several code points. JS .length counts UTF-16 units; UTF-8 counts bytes.