Is there a type of function where every point has exactly one tangent line passing through it? If yes, what is this type of function called?

Eg a parabola y=x² Jesus, of course, spoke in parabolas. In those days it was like the Beatles at Sh...
Eg a parabola y=x² Jesus, of course, spoke in parabolas. In those days it was like the Beatles at Sh...
Jasmine Paolini calls partner Sara Errani a "legend" and an "inspiration" after they win the French...
China was treated like dirt by “Westerners’ for several hundred years. Their achievements, both cult...
Enslavement of the Jews, gays, Roma, political prisoners and working them to death during WW2, ensla...
I don't think that anyone can always get their type of girl, 100% of the time. It's unrealistic. Eve...
You work from 9 to 5 each day. Tiring officework/college works, hectic schedules, exhilarating deadl...
A molecular reinterpretation of Alice in Wonderland reveals an ancient protein with a surprising fun...
Researchers have created a 3D mouse organoid model to study how neurons in the nose regenerate, reve...
Research on 28,000 US adults found that low-calorie diets were linked with a heightened risk of depr...
A doctor weighs in on everything you need to know about the trendy "retinol" diet.
The new season premieres on Thursday, July 17.
A massive volcanic aquifer has been discovered in the Oregon Cascades, vital for mitigating droughts...