near lemmas about derivation #992

Job	Run time
coq	40s
mathcomp-analysis-single	13m 56s
mathcomp	46s
mathcomp-classical	3m 17s
mathcomp-reals	4m 9s
mathcomp-analysis	11m 6s
mathcomp-experimental-reals	1m 49s
mathcomp-reals-stdlib	1m 26s
ssprove	19m 7s
mathcomp-analysis-stdlib	11m 11s
	1h 7m 27s

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