this is the lemma of Whitehead
And i really don't understand the proof
How to see that $k$ is well defined (i.e how to write an element from $X\cup_{\varphi_i}e^{\lambda} , i=0,1$ )
and how to write $l$ ?
Please
Thank you
2026-05-05 22:34:53.1778020493
Lemma of Whitehead
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