... there are two topics in StackExchange contining such symbols: https://math.stackexchange.com/questions/46678/what-are-usual-notations-for-surjective-injective-and-bijective-functions
https://math.stackexchange.com/questions/20015/special-arrows-for-notation-of-morphism s Unfortunately, there is no reference to a textbook... Alexander On Saturday, April 18, 2020 at 4:14:46 PM UTC+2, Norman Megill wrote: > > Regarding: > > F : A -1-1-> --------> F : A >--> B > F : A -onto-> --------> F : A -->> B > F : A -1-1-onto-> --------> F : A >-->> B > > Do you have a textbook reference for the new symbols you propose? > > The current symbols we use are from Takeuti & Zaring. The are rendered > exactly as in the book on the GIF pages. There are no Unicode symbols for > them, so we provided a rough approximation (putting the symbol parts in a > line instead of stacked vertically). > > Norm > -- You received this message because you are subscribed to the Google Groups "Metamath" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/metamath/0304bbcc-99a5-485b-a257-42e0b416db11%40googlegroups.com.
