Proof of binary tree node formula?

how to prove that a binary tree with a depth of k (k > = 1) has at most nodes?

Algorithm binary-tree
Nov.17,2021

Mathematical induction,
or buy this algorithm textbook to learn from scratch

binary tree characteristics and proof
hope it can help you.

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MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1e47a77-44c6d.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e47a77-44c6d.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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