Personal notes

algebric-identities.md

Common algebric identities:

This sentence uses $` and `$ delimiters to show math inline: $\sqrt{3x-1}+(1+x)^2$

• $(a+b)^2 = a^2 + 2ab + b^2$
• $(a-b)^2 = a^2 - 2ab + b^2$
• $a^2+b^2 = (a+b)^2 - 2ab$
• $a^2-b^2 = (a+b) - (a-b)$
• $(a+b+c)^2 = (a^2 + b^2 + c^2) + 2(ab + ac + bc)$
• $(a^2 + b^2 + c^2) = (a+b+c) - 2(ab + ac + bc)$

keychron-k3-us.md

Fn combinations

Keys	Function
Fn-	RGB Speed Decrease
Fn=	RGB Speed Increase
Fn1	Select Bluetooth device #1
Fn2	Select Bluetooth device #2
Fn3	Select Bluetooth device #3
Fn1	(long press for 3s) Pair with Bluetooth device #1
Fn2	(long press for 3s) Pair with Bluetooth device #2
Fn3	(long press for 3s) Pair with Bluetooth device #3
Fn💡	Turn On / Off the Backlight
Fn→	(Only works for RGB-backlit version) Change The Backlight Color
Fn←	(Only works for RGB-backlit version) Change The Backlight Color
FnDel	Insert
FnF1	(Mac mode) F1
FnF2	(Mac mode) F2
FnF3	(Mac mode) F3
FnF4	(Mac mode) F4
FnF5	(Mac mode) F5
FnF6	(Mac mode) F6
FnF7	(Mac mode) F7
FnF8	(Mac mode) F8
FnF9	(Mac mode) F9
FnF10	(Mac mode) F10
FnF11	(Mac mode) F11
FnF12	(Mac mode) F12
FnF1	(Windows mode) Screen Brightness Down
FnF2	(Windows mode) Screen Brightness Up
FnF3	(Windows mode) Launches Mission Control
FnF4	(Windows mode) Launchpad
FnF5	(Windows mode) Keyboard Backlight Down
FnF6	(Windows mode) Keyboard Backlight Up
FnF7	(Windows mode) Rewind
FnF8	(Windows mode) Play / Pause
FnF9	(Windows mode) Fast Forward
FnF10	(Windows mode) Sound: Volume Mute
FnF11	(Windows mode) Sound: Volume Down
FnF12	(Windows mode) Sound: Volume Up
FnWin	(Windows mode, long press for 3s) Lock / Unlock the Win Key
FnB	Check Battery (Still in Beta, not 100% accurate）
FnL💡	(long press for 3s) Lock / Unlock the Backlight Effect
FnSO	(Bluetooth mode, long press for 3s) Disable / Enable the Auto Sleep Mode
FnSLR	(Bluetooth mode, long press for 3s) Auto Sleep in 10 Minutes Without Typing
FnSLT	(Bluetooth mode, long press for 3s) Auto Sleep in 20 Minutes Without Typing
FnSLY	(Bluetooth mode, long press for 3s) Auto Sleep in 30 Minutes Without Typing
FnJZ	(long press for 3s) Reset the Keyboard
FnXL	(Windows mode, long press for 3s)
FnKC	(Mac mode, long press for 3s) Switch Between Function Keys and Multimedia Keys (Only works for F5 and F6)
FnID	(long press for 3s) Switch Between the Delete Key and the Insert Key

RGB-Backlight Version

• Backlight Red = 0~30% Power
• Backlight Blue = 30%~70% Power
• Backlight Green = 70%~100% Power

White-Backlight Version

• Two Rows Backlight off & the Other On = 0~30% Power
• One Row Backlight off & the Other On= 30%~70% Power
• All Backlight On = 70%~100% Power

Non-Backlight Version

Backlight in Red	Power Level
1	0~30%
12	30%~70%
123	70%~100%

nuphy-air75-v2-ansi.md

Fn combinations

Keys	Function
Fn\	Battery Level indicator toggle
Fn]	Sleep mode toggle
Fn1	Select Bluetooth device 1
Fn2	Select Bluetooth device 2
Fn3	Select Bluetooth device 3
Fn4	Select Dongle device
Fn1	(long press for 3s) Pair with Bluetooth device 1
Fn2	(long press for 3s) Pair with Bluetooth device 2
Fn3	(long press for 3s) Pair with Bluetooth device 3
Fn4	(long press for 3s) Pair with Dongle device
Fn💡	Turn On / Off the Backlight
Fn←	Change the backlight effect pattern
Fn→	Change the backlight effect color
FnDel	Insert
FnF1	(Mac mode) F1
FnF2	(Mac mode) F2
FnF3	(Mac mode) F3
FnF4	(Mac mode) F4
FnF5	(Mac mode) F5
FnF6	(Mac mode) F6
FnF7	(Mac mode) F7
FnF8	(Mac mode) F8
FnF9	(Mac mode) F9
FnF10	(Mac mode) F10
FnF11	(Mac mode) F11
FnF12	(Mac mode) F12
FnF1	(Windows mode) Screen Brightness Down
FnF2	(Windows mode) Screen Brightness Up
FnF3	(Windows mode) Launches Mission Control
FnF4	(Windows mode) Launchpad
FnF5	(Windows mode) Keyboard Backlight Down
FnF6	(Windows mode) Keyboard Backlight Up
FnF7	(Windows mode) Rewind
FnF8	(Windows mode) Play / Pause
FnF9	(Windows mode) Fast Forward
FnF10	(Windows mode) Sound: Volume Mute
FnF11	(Windows mode) Sound: Volume Down
FnF12	(Windows mode) Sound: Volume Up
FnWin	(Windows mode, long press for 3s) Lock / Unlock the Win Key
FnB	Check Battery (Still in Beta, not 100% accurate）
FnL💡	(long press for 3s) Lock / Unlock the Backlight Effect
FnSO	(Bluetooth mode, long press for 3s) Disable / Enable the Auto Sleep Mode
FnSLR	(Bluetooth mode, long press for 3s) Auto Sleep in 10 Minutes Without Typing
FnSLT	(Bluetooth mode, long press for 3s) Auto Sleep in 20 Minutes Without Typing
FnSLY	(Bluetooth mode, long press for 3s) Auto Sleep in 30 Minutes Without Typing
FnJZ	(long press for 3s) Reset the Keyboard
FnXL	(Windows mode, long press for 3s)
FnKC	(Mac mode, long press for 3s) Switch Between Function Keys and Multimedia Keys (Only works for F5 and F6)
FnID	(long press for 3s) Switch Between the Delete Key and the Insert Key

RGB-Backlight Version

• Backlight Red = 0~30% Power
• Backlight Blue = 30%~70% Power
• Backlight Green = 70%~100% Power

White-Backlight Version

• Two Rows Backlight off & the Other On = 0~30% Power
• One Row Backlight off & the Other On= 30%~70% Power
• All Backlight On = 70%~100% Power

Non-Backlight Version

Backlight in Red	Power Level
1	0~30%
12	30%~70%
123	70%~100%

windows-shortcuts.md

Windows keyboard shortcuts

Shortcut	Action
Ctrlc	Copy
Ctrlv	Paste
Ctrlx	Cut
Ctrlz	Undo
Ctrly	Redo
Ctrls	Save
Ctrlp	Print
Ctrlf	Search
Ctrlh	Replace
Ctrla	Select all
Ctrln	Create new
Ctrlw	Close
Ctrld	Move to trash
ShiftDel	Delete
AltTab	Switch window
AltEnter	Properties
Alt←	Previous folder
Alt→	Next folder
CtrlShiftn	New folder
CtrlShiftEsc	Task manager
CtrlAltDel	Force quit
Winv	Clipboard
Wind	Show desktop
Win←	Pin window to half left
Win→	Pin window to half right
Win↑	Pin screen to half top
Win↓	Pin window to half bottom
F1	Help
F2	Rename
F3	Search
F4	Address bar
F5	Refresh window contents
F11	Full screen
F12	Save as
WinPrtScr	Screenshot
WinShifts	Partial screenshot
CtrlWinf4	Delete virtual desktop
CtrlWin→	Move to the next virtual desktop
CtrlWin←	Move to the previous virtual desktop