[gore3000]

However, let me point out that one of the things elementary textbooks ought to strive for is simplicity of presentation.

No, the most important thing they must strive for is the truth. Further, one should never talk down to kids. They are quite smart.

[donh]

No, the most important thing they must strive for is the truth. Further, one should never talk down to kids. They are quite smart.

Pitching explanations to the level of the audience is not "talking down", particularly in an elementary educational setting.