It can also be used to negate symbols (∈∉, ∃∄), or to access uppercase-versions of letters (δΔ, θΘ, σΣ). This is useful for certain symbols like roots (√, ∛, ∜) and integrals (∫, ∬, ∭). We can push this approach even further by allowing certain symbols to have multiple different versions accessible by double-tapping, triple-tapping, or even quadruble-tapping the same button. And by a lucky coincidence we can exactly fit the 26 greek letters by placing two on each button! Perfect. Therefore, by giving up only 3 buttons for Shift, Alt, and Opt, we can fit 6 times as many symbols on the remaining 13 buttons. The same is true for the cyan B-coloumn, which is accessed by holding down Opt. If you hold Shift while pressing the button, you get A. If you hold Alt while pressing the button, you get α, the front-facing symbol. The button is separated into two columns of symbols: A blue A-column, and a cyan B-column. f you simply press the button, you get a. A single keycap showing the locations of the 6 symbols that it can fit. I take advtantage of the fact that the keycaps have a sloped front so one can see symbols printed on the front face. This may sound like it will get confusing very quickly, but I think it'll work fine. They all have numbers and symbols on each button.įor the mathematical keyboard, I decided to fit 6 symbols per button. Just look at the number row, for example. Everyone is already used to the concept of keyboard buttons having more than one symbol. The second solution is a bit more tricky because it requires us to make a decision about which symbols common enough to be granted a spot on the math keyboard.
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