notation - What does := mean? - Mathematics Stack Exchange Other symbols I have seen used for "is defined to be equal to" are three horizontal lines instead of two, and $=$ with either a triangle or "def" written directly above it I have seen variants of these used by people who predate widespread knowledge of computer programming It would be interesting to know the earliest uses of a special symbol for this (and what symbols were chosen) An
notation - what does ≼ or ≺ mean? - Mathematics Stack Exchange I was reading a paper about well-orderings and this came up: Suppose (E, ≤) and (F, ≼) are isomorphic well-orderings Then there exists a unique isomorphism for (E, ≤) to (F, ≼) I've been scouri
What is the meaning of ⊊? - Mathematics Stack Exchange I have encountered this when referencing subsets and vector subspaces For example, T ⊊ span(S) should mean that T is smaller than span(S)--at least from what I've gathered Is ⊊ a sort of ≤ or lt
notation - Whats the difference between ≡ and ≣? - Mathematics . . . $\equiv$ and similar variations are a generic symbols used to notate an equivalence relation $=$ is the specific equivalence relation "equals" that we are used to with sets and natural numbers and by extension is also the symbol used for equality of rational, real, complex numbers etc For more information on the definition of a specific equivalence relation, you will need to provide
The meaning of this symbol - Mathematics Stack Exchange This page is from Measure and category by John C Oxtoby page 20 What is the meaning of this symbol? I added a red line under it There is no definition of this symbol in this book, so I couldn't
inequality - What does lt; gt; mean? - Mathematics Stack Exchange What do the less-than and greater-than symbols right next to each other mean? Does it mean either less than or greater than? In other words, not equal? I am trying to understand a book that says th