But there are also variants of U+2264 (≤) and U+2265 (≥) with dots within the bracket (starting page 973 in the same book) for "weak precedence" of operators...
These variants (used to compine ⋖ or ⋗ with ≐) don't seem to be encoded. 2016-06-26 11:38 GMT+02:00 Andrew West <[email protected]>: > On 26 June 2016 at 09:37, Costello, Roger L. <[email protected]> wrote: > > > > In the book Parsing Techniques the authors use a less than symbol with a > dot tucked inside for the open parenthesis and a greater than symbol with a > dot tucked insider for the close parenthesis. Also, they use an equal sign > with a dot over it. You can see the 3 symbols here: > > > > > https://books.google.com/books?id=05xA_d5dSwAC&pg=PA267&lpg=PA267&dq=parenthesis+generator+symbols&source=bl&ots=3OwyeBndO8&sig=ZhwoeYRJjm3GTzNNP1vgsAVRisc&hl=en&sa=X&sqi=2&ved=0ahUKEwi577X-o8XNAhWBaz4KHc0QA_EQ6AEIIzAB#v=onepage&q=parenthesis%20generator%20symbols&f=false > > > > Are there Unicode symbols for the 3 symbols? > > Yes, and they have all been around since Unicode 1.0: > > U+22D6 ⋖ > U+22D7 ⋗ > U+2250 ≐ (named APPROACHES THE LIMIT) > > Andrew > >
