Talk:Dual system

Changes as of 18th Feb 21
Especially, if $$K \in \{\R,\C\} $$ we denote it by $$\mathbb K$$ or $$\mathbb k$$ or $𝕂$, so that we notice that it is NOT a variable. –Nomen4Omen (talk) 19:17, 18 February 2021 (UTC)
 * Perhaps not the kind of variable as most people think of it, but here it is a variable that takes values that are sets (or fields). There are numerous articles in mathematics in WP that denote an unspecified field as $K$ or $F$, for example the articles Field (mathematics), Finite field, Algebra over a field, Vector space,, Exterior algebra.  —Quondum 20:14, 18 February 2021 (UTC)
 * Is black-board K a neologism of some kind? I can see why it is appealing, but I've never seen in any math book I've ever read, nor have I seen it in Wikipedia, up until today. 67.198.37.16 (talk) 05:09, 26 November 2023 (UTC)