Talk:Phi

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Grain Size

Phi is a symbol used when describing grain size in sedimentology. Wentworth and Krumbian scales both use φ to describe the size of individual sediment particles.

This should be added to the list of scientific measurements that utilize phi.

See more here: https://en.wikipedia.org/wiki/Grain_size

alternate symbol

the first line "lowercase φ or ϕ" shows two identical symbols on my computer and it's not clear how they are distinguished. i'm not sure how you could guarantee that both different symbols are shown.

Inclusion of 𝚽 as representative of the predicate in set-builder notation

Latest comment: 5 months ago1 comment1 person in discussion

It would be useful to highlight that, of the three-part set-builder notation, "The formula 𝚽(𝑥) is said to be the rule or the predicate"--~2026-73652-3 (talk) 23:52, 2 February 2026 (UTC)Reply

This page was redesigned at the edge.

Grain Size

alternate symbol

Inclusion of 𝚽 as representative of the predicate in set-builder notation