Redefining functions?

Good morning,

First, I am a new learner and this is my first post ! I am really happy to join the community.

I am discovering Elixir syntax and I had a quick question:

Why can’t I use this syntax ?

Enum.all?([1, 30], is_number) 

If I do this I get the following error

** (CompileError) iex:9: undefined function is_number/0
(stdlib) lists.erl:1354: :lists.mapfoldl/3
(stdlib) lists.erl:1355: :lists.mapfoldl/3

I expected Elixir to find is_number/1

Instead, this works:

Enum.all?([1, 30], &is_number(&1))
Enum.all?([1, "hi"], fn x -> is_number(x) end)
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