Proof

[runic inlet]

Can someone explain why its 0</ instead of 0<

[polar scaffold]

second page

[runic inlet]

but it says it doesnt work if k = 0

so why not just keep <

cause </ means equal or less than

[polar scaffold]

they subbed in k=0 at it proved there wasnt any roots so the range of k that cause the equation to have no roots will include the 0

[runic inlet]

ohhh

so it has no real roots between 0</k<0.9

[polar scaffold]

0<=k<0.88888888... yeh