Practice problem
Which of these is equivalent to the triangle inequality?
−∣b+a∣≥−∣b∣−∣a∣-|b+a|\geq-|b|-|a|−∣b+a∣≥−∣b∣−∣a∣
∣b−a∣≥−∣b∣−∣a∣|b-a|\geq-|b|-|a|∣b−a∣≥−∣b∣−∣a∣
−∣b+a∣≥∣b∣−∣a∣-|b+a|\geq|b|-|a|−∣b+a∣≥∣b∣−∣a∣
Type a concept, like “slope” or “photosynthesis”.