29 авг. 2018 г. · The symbols themselves, φ and ψ, are simply names of the functions. These are the Greek lowercase letters phi and psi.

25 июн. 2014 г. · ∈ means '(is) an element of a set'. For instance, 'Let a∈A' means 'Let a be an element of A'.

10 нояб. 2012 г. · This means "an element of". For example, if we denote the set of natural numbers by N then 1∈N. Similarly, 1,2,3,… ∈N, and −1∉N.

13 апр. 2017 г. · This symbol just means 'because'. If it was facing up, it means 'therefore'. Kinda feel like this is too short but I guess there's not much to this question. Не найдено: trident | Нужно включить: trident

20 февр. 2013 г. · There is also the symbol ∙≡ to denote "such that" which is very uncommon, but I sometimes like to use it, though I never use it when posting ... Не найдено: trident | Нужно включить: trident